Add tests for linux/if.h for additional IFF_ flags

Also remove unneeded platform gating

Author: NoraCodes

libc-test/build.rs

@@ -91,6 +91,9 @@ fn main() {
         cfg.header("sys/mman.h");
         cfg.header("sys/resource.h");
         cfg.header("sys/socket.h");
+        if linux {
+            cfg.header("linux/if.h");
+        }
         cfg.header("sys/time.h");
         cfg.header("sys/un.h");
         cfg.header("sys/wait.h");
@@ -662,6 +665,8 @@ fn main() {
         } else {
             cfg.header("linux/fcntl.h");
         }
+        cfg.header("net/if.h");
+        cfg.header("linux/if.h");
         cfg.header("linux/quota.h");
         cfg.skip_const(move |name| {
             match name {

src/unix/notbsd/linux/mod.rs

@@ -621,11 +621,8 @@ pub const F_TEST: ::c_int = 3;
 pub const F_TLOCK: ::c_int = 2;
 pub const F_ULOCK: ::c_int = 0;
 
-#[cfg(any(target_arch="x86_64", target_arch="x86"))]
 pub const IFF_LOWER_UP: ::c_int = 0x10000;
-#[cfg(any(target_arch="x86_64", target_arch="x86"))]
 pub const IFF_DORMANT: ::c_int = 0x20000;
-#[cfg(any(target_arch="x86_64", target_arch="x86"))]
 pub const IFF_ECHO: ::c_int = 0x40000;
 
 pub const ST_RDONLY: ::c_ulong = 1;