change getnameinfo flags type to int to conform to other libc implementations

Author: skrap

libc-test/build.rs

@@ -2708,6 +2708,10 @@ fn test_linux(target: &str) {
             "posix_spawn_file_actions_init" if uclibc => true,
             "posix_spawn_file_actions_destroy" if uclibc => true,
 
+            // uclibc defines the flags type as a uint, but dependent crates
+            // assume it's a int instead.
+            "getnameinfo" if uclibc => true,
+
             _ => false,
         }
     });

src/unix/linux_like/linux/uclibc/mod.rs

@@ -271,7 +271,7 @@ extern "C" {
         hostlen: ::socklen_t,
         serv: *mut ::c_char,
         sevlen: ::socklen_t,
-        flags: ::c_uint,
+        flags: ::c_int,
     ) -> ::c_int;
 
     pub fn pwritev(