haiku: Add missing lutimes

* BeOS traditionally didn't have lutimes, however to make Haiku
  more compatible and easier to port for, we added an implementation
  of it.

Author: kallisti5

src/unix/haiku/mod.rs

@@ -1112,6 +1112,7 @@ extern {
                     addrlen: *mut ::socklen_t) -> ::ssize_t;
     pub fn mkstemps(template: *mut ::c_char, suffixlen: ::c_int) -> ::c_int;
     pub fn futimes(fd: ::c_int, times: *const ::timeval) -> ::c_int;
+    pub fn lutimes(file: *const ::c_char, times: *const ::timeval) -> ::c_int;
     pub fn nl_langinfo(item: ::nl_item) -> *mut ::c_char;
 
     pub fn bind(socket: ::c_int, address: *const ::sockaddr,