Auto merge of rust-lang#790 - semarie:bsd-utimens, r=alexcrichton

add utimensat to NetBSD and OpenBSD

Author: bors

src/unix/bsd/netbsdlike/mod.rs

@@ -589,6 +589,8 @@ extern {
                   iovcnt: ::c_int,
                   offset: ::off_t) -> ::ssize_t;
     pub fn futimens(fd: ::c_int, times: *const ::timespec) -> ::c_int;
+    pub fn utimensat(dirfd: ::c_int, path: *const ::c_char,
+                     times: *const ::timespec, flag: ::c_int) -> ::c_int;
     pub fn fdatasync(fd: ::c_int) -> ::c_int;
     pub fn openpty(amaster: *mut ::c_int,
                    aslave: *mut ::c_int,