Warn users of gettimeofday of potential breaking change

Author: gnzlbg

src/unix/mod.rs

@@ -837,6 +837,10 @@ extern {
     pub fn flock(fd: ::c_int, operation: ::c_int) -> ::c_int;
 
     #[cfg_attr(target_os = "netbsd", link_name = "__gettimeofday50")]
+    #[deprecated(
+        since="0.2.54",
+        note="The signature of this function is incorrect. If you are using it, please report that in the following issue so that we can evaluate the impact of fixing it: https://github.com/rust-lang/libc/issues/1338"
+    )]
     pub fn gettimeofday(tp: *mut ::timeval,
                         tz: *mut ::c_void) -> ::c_int;
     #[cfg_attr(target_os = "netbsd", link_name = "__times13")]