sys/io.h only in linux x86_64

Make changes to reflect this

Author: Andrew Salmon

libc-test/build.rs

@@ -180,6 +180,9 @@ fn main() {
         cfg.header("sys/fsuid.h");
         cfg.header("pty.h");
         cfg.header("shadow.h");
+        if x86_64 {
+            cfg.header("sys/io.h");
+        }
     }
 
     if linux || android {
@@ -195,7 +198,6 @@ fn main() {
         cfg.header("sys/syscall.h");
         cfg.header("sys/personality.h");
         cfg.header("sys/swap.h");
-        cfg.header("sys/io.h");
         if !uclibc {
             cfg.header("sys/sysinfo.h");
         }

src/unix/notbsd/linux/other/b64/x86_64.rs

@@ -512,4 +512,7 @@ extern {
                        argc: ::c_int, ...);
     pub fn swapcontext(uocp: *mut ucontext_t,
                        ucp: *const ucontext_t) -> ::c_int;
+    pub fn iopl(level: ::c_int) -> ::c_int;
+    pub fn ioperm(from: ::c_ulong, num: ::c_ulong,
+                  turn_on: ::c_int) -> ::c_int;
 }

src/unix/notbsd/mod.rs

@@ -999,9 +999,6 @@ extern {
     pub fn swapoff(puath: *const ::c_char) -> ::c_int;
     pub fn getdomainname(name: *mut ::c_char, len: ::size_t) -> ::c_int;
     pub fn setdomainname(name: *const ::c_char, len: ::size_t) -> ::c_int;
-    pub fn iopl(level: ::c_int) -> ::c_int;
-    pub fn ioperm(from: ::c_ulong, num: ::c_ulong,
-                  turn_on: ::c_int) -> ::c_int;
     pub fn acct(filename: *const ::c_char) -> ::c_int;
     pub fn brk(addr: *mut ::c_void) -> ::c_int;
     pub fn sbrk(increment: ::intptr_t) -> *mut ::c_void;