ioctl: reintroduce libc ioctl workaround until we can use updated liblibc

This PR fixes the issue upstream rust-lang/rust#26809
but no version 0.2.0 of the crate has been published as of yet.

Signed-off-by: Paul Osborne <[email protected]>

Author: posborne

src/sys/ioctl/mod.rs

@@ -104,8 +104,12 @@ mod platform;
 
 pub use self::platform::*;
 
+// liblibc has the wrong decl for linux :| hack until #26809 lands.
+extern "C" {
+    #[doc(hidden)]
+    pub fn ioctl(fd: libc::c_int, req: libc::c_ulong, ...) -> libc::c_int;
+}
+
 /// A hack to get the macros to work nicely.
 #[doc(hidden)]
 pub use ::libc as libc;
-#[doc(hidden)]
-pub use ::libc::funcs::bsd44::ioctl;