fixup! Add ttyname_r

Add cfg_attr

Author: dbrgn

src/unix/mod.rs

@@ -753,6 +753,8 @@ extern {
     pub fn tcgetpgrp(fd: ::c_int) -> pid_t;
     pub fn tcsetpgrp(fd: ::c_int, pgrp: ::pid_t) -> ::c_int;
     pub fn ttyname(fd: ::c_int) -> *mut c_char;
+    #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
+               link_name = "ttyname_r$UNIX2003")]
     pub fn ttyname_r(fd: ::c_int,
                      buf: *mut c_char, buflen: ::size_t) -> ::c_int;
     pub fn unlink(c: *const c_char) -> ::c_int;