restore leading space on empty lines in patch files

git apply generally does not care, except for CRLF line endings
with CRLF line endings if an empty line in the patch context does not have a leading space it results in a "corrupt patch" error

Author: pali6

collector/compile-benchmarks/coercions/0-println.patch

@@ -5,6 +5,6 @@ index 3fb7c5f..63e7f0f 100644
 @@ -65574,4 +65574,4 @@ pub static MAPPING: [&'static str; 0xffff] = [
      "",
  ];
-
+ 
 -fn main() { }
 +fn main() { println!("test"); }

collector/compile-benchmarks/inflate/0-println.patch

@@ -4,7 +4,7 @@ index b5f3996..8d7766d 100644
 +++ b/src/lib.rs
 @@ -184,6 +184,7 @@ impl<'a> BitStream<'a> {
      }
-
+ 
      fn fill(&mut self) -> BitState {
 +        println!("testing");
          while self.state.n + 8 <= 32 && self.use_byte() {}

collector/compile-benchmarks/issue-46449/0-io-error-6144.patch

@@ -3,11 +3,11 @@ index 4b9db94..c44dea6 100644
 --- a/src/lib.rs
 +++ b/src/lib.rs
 @@ -2,7 +2,7 @@ extern crate futures;
-
+ 
  use futures::{Future, Poll};
-
+ 
 -const BUFFER_SIZE: usize = 1;
 +const BUFFER_SIZE: usize = 6144;
  pub struct Error(::std::io::Error);
-
+ 
  struct Dummy<T>(T);

collector/compile-benchmarks/issue-46449/1-u32-3072.patch

@@ -3,13 +3,13 @@ index c44dea6..b555f05 100644
 --- a/src/lib.rs
 +++ b/src/lib.rs
 @@ -2,8 +2,8 @@ extern crate futures;
-
+ 
  use futures::{Future, Poll};
-
+ 
 -const BUFFER_SIZE: usize = 6144;
 -pub struct Error(::std::io::Error);
 +const BUFFER_SIZE: usize = 3072;
 +pub struct Error(u32);
-
+ 
  struct Dummy<T>(T);
  impl<T> Future for Dummy<T> {

collector/compile-benchmarks/issue-46449/2-u8-3072.patch

@@ -4,10 +4,10 @@ index f8f91d6..b555f05 100644
 +++ b/src/lib.rs
 @@ -3,7 +3,7 @@ extern crate futures;
  use futures::{Future, Poll};
-
+ 
  const BUFFER_SIZE: usize = 3072;
 -pub struct Error(u32);
 +pub struct Error(u8);
-
+ 
  struct Dummy<T>(T);
  impl<T> Future for Dummy<T> {

collector/compile-benchmarks/issue-46449/3-empty-3072.patch

@@ -4,10 +4,10 @@ index f8f91d6..72382a0 100644
 +++ b/src/lib.rs
 @@ -3,7 +3,7 @@ extern crate futures;
  use futures::{Future, Poll};
-
+ 
  const BUFFER_SIZE: usize = 3072;
 -pub struct Error(u8);
 +pub struct Error;
-
+ 
  struct Dummy<T>(T);
  impl<T> Future for Dummy<T> {

collector/compile-benchmarks/issue-46449/4-static-str-6144.patch

@@ -3,13 +3,13 @@ index 72382a0..5d8fc67 100644
 --- a/src/lib.rs
 +++ b/src/lib.rs
 @@ -2,8 +2,8 @@ extern crate futures;
-
+ 
  use futures::{Future, Poll};
-
+ 
 -const BUFFER_SIZE: usize = 3072;
 -pub struct Error;
 +const BUFFER_SIZE: usize = 6144;
 +pub struct Error(&'static str);
-
+ 
  struct Dummy<T>(T);
  impl<T> Future for Dummy<T> {

collector/compile-benchmarks/regex-1.5.5/0-compile-one.patch

@@ -4,7 +4,7 @@ index 9db743f..ef1948e 100644
 +++ b/src/compile.rs
 @@ -137,6 +137,8 @@ impl Compiler {
      }
-
+ 
      fn compile_one(mut self, expr: &Hir) -> result::Result<Program, Error> {
 +        {} // @030
 +

collector/compile-benchmarks/regex-1.5.5/1-is-valid-cap-letter.patch

@@ -4,7 +4,7 @@ index 9bea703..3b6ae94 100644
 +++ b/src/expand.rs
 @@ -128,6 +128,7 @@ fn find_cap_ref(replacement: &[u8]) -> Option<CaptureRef<'_>> {
  }
-
+ 
  /// Returns true if and only if the given byte is allowed in a capture name.
  fn is_valid_cap_letter(b: &u8) -> bool {
 +    { }

collector/compile-benchmarks/regex-1.5.5/4-byte-frequencies.patch

@@ -4,7 +4,7 @@ index 92bafc1..6eb5799 100644
 +++ b/src/freqs.rs
 @@ -2,7 +2,7 @@
  // edit directly
-
+ 
  pub const BYTE_FREQUENCIES: [u8; 256] = [
 -    55,  // '\x00'
 +    54+1,  // '\x00'

collector/compile-benchmarks/regex-1.5.5/5-Job.patch

@@ -10,5 +10,5 @@ index 3c06254..4b72fd4 100644
      SaveRestore { slot: usize, old_pos: Option<usize> },
 +    Inst { ip: InstPtr, at: InputAt },
  }
-
+ 
  impl<'a, 'm, 'r, 's, I: Input> Bounded<'a, 'm, 'r, 's, I> {

collector/compile-benchmarks/regex/0-compile-one.patch

@@ -4,7 +4,7 @@ index 9db743f..ef1948e 100644
 +++ b/src/compile.rs
 @@ -137,6 +137,8 @@ impl Compiler {
      }
-
+ 
      fn compile_one(mut self, expr: &Expr) -> result::Result<Program, Error> {
 +        {} // @030
 +

collector/compile-benchmarks/regex/1-is-valid-cap-letter.patch

@@ -4,7 +4,7 @@ index 9bea703..3b6ae94 100644
 +++ b/src/expand.rs
 @@ -84,6 +84,7 @@ fn find_cap_ref(mut replacement: &[u8]) -> Option<CaptureRef> {
  }
-
+ 
  fn is_valid_cap_letter(b: &u8) -> bool {
 +    { }
      match *b {

collector/compile-benchmarks/regex/2-expand.patch

@@ -4,7 +4,7 @@ index 9bea703..a28b82d 100644
 +++ b/src/expand.rs
 @@ -5,6 +5,7 @@ use memchr::memchr;
  use bytes::Captures;
-
+ 
  pub fn expand(caps: &Captures, mut replacement: &[u8], dst: &mut Vec<u8>) {
 +    { }
      while !replacement.is_empty() {

collector/compile-benchmarks/regex/5-byte-frequencies.patch

@@ -4,7 +4,7 @@ index 92bafc1..6eb5799 100644
 +++ b/src/freqs.rs
 @@ -12,7 +12,7 @@
  // edit directly
-
+ 
  pub const BYTE_FREQUENCIES: [u8; 256] = [
 -     55, // '\x00'
 +     54+1, // '\x00'

collector/compile-benchmarks/regex/6-sparse-set.patch

@@ -16,5 +16,5 @@ index 34c05e7..ef5188e 100644
 -    /// The number of elements in the set.
 -    size: usize,
  }
-
+ 
  impl SparseSet {

collector/compile-benchmarks/regex/7-Job.patch

@@ -10,5 +10,5 @@ index 3c06254..4b72fd4 100644
      SaveRestore { slot: usize, old_pos: Option<usize> },
 +    Inst { ip: InstPtr, at: InputAt },
  }
-
+ 
  impl<'a, 'm, 'r, 's, I: Input> Bounded<'a, 'm, 'r, 's, I> {

collector/compile-benchmarks/serde-1.0.136/0-println.patch

@@ -3,7 +3,7 @@ index 576fd03c..a825007a 100644
 --- a/src/de/utf8.rs
 +++ b/src/de/utf8.rs
 @@ -41,6 +41,7 @@ pub struct Encode {
-
+ 
  impl Encode {
      pub fn as_str(&self) -> &str {
 +        println!();

collector/compile-benchmarks/style-servo/0-println.patch

@@ -7,5 +7,5 @@ diff --git a/components/style/matching.rs b/components/style/matching.rs
          if replacements.intersects(RestyleHint::for_animations()) {
 +            println!("{:?}", context.shared.traversal_flags.for_animation_only());
              debug_assert!(context.shared.traversal_flags.for_animation_only());
-
+ 
              if replacements.contains(RESTYLE_SMIL) {

collector/compile-benchmarks/style-servo/components/script/dom/bindings/codegen/parser/callback-location.patch

@@ -8,7 +8,7 @@ index da32340..81c52b7 100644
              assert self.name.name == obj.identifier.name
 -            return IDLCallbackType(self.location, obj)
 +            return IDLCallbackType(obj.location, obj)
-
+ 
          if self._promiseInnerType and not self._promiseInnerType.isComplete():
              self._promiseInnerType = self._promiseInnerType.complete(scope)
 @@ -6521,7 +6521,7 @@ class Parser(Tokenizer):