freebsdlike: move aio_ and mq_ functions to #[link(name = "rt")]

I just got 'libxul.so: Undefined symbol "mq_close"' when rebuilding Firefox..
How did no one catch this before??

This is correct for both FreeBSD and DragonFly:
https://github.com/freebsd/freebsd/blob/master/lib/librt/Symbol.map
https://github.com/DragonFlyBSD/DragonFlyBSD/blob/e7ab884bd49753f8884eb597d10d6569a08fa0df/lib/librt/mq.c
https://github.com/DragonFlyBSD/DragonFlyBSD/blob/e7ab884bd49753f8884eb597d10d6569a08fa0df/lib/librt/aio.c

Author: valpackett

src/unix/bsd/freebsdlike/mod.rs

@@ -1215,17 +1215,6 @@ extern "C" {
         addrlen: *mut ::socklen_t,
         flags: ::c_int,
     ) -> ::c_int;
-    pub fn aio_read(aiocbp: *mut aiocb) -> ::c_int;
-    pub fn aio_write(aiocbp: *mut aiocb) -> ::c_int;
-    pub fn aio_fsync(op: ::c_int, aiocbp: *mut aiocb) -> ::c_int;
-    pub fn aio_error(aiocbp: *const aiocb) -> ::c_int;
-    pub fn aio_return(aiocbp: *mut aiocb) -> ::ssize_t;
-    pub fn aio_suspend(
-        aiocb_list: *const *const aiocb,
-        nitems: ::c_int,
-        timeout: *const ::timespec,
-    ) -> ::c_int;
-    pub fn aio_cancel(fd: ::c_int, aiocbp: *mut aiocb) -> ::c_int;
     pub fn chflags(path: *const ::c_char, flags: ::c_ulong) -> ::c_int;
     pub fn chflagsat(
         fd: ::c_int,
@@ -1311,43 +1300,6 @@ extern "C" {
         mode: ::mode_t,
         dev: dev_t,
     ) -> ::c_int;
-    pub fn mq_close(mqd: ::mqd_t) -> ::c_int;
-    pub fn mq_getattr(mqd: ::mqd_t, attr: *mut ::mq_attr) -> ::c_int;
-    pub fn mq_notify(mqd: ::mqd_t, notification: *const ::sigevent)
-        -> ::c_int;
-    pub fn mq_open(name: *const ::c_char, oflag: ::c_int, ...) -> ::mqd_t;
-    pub fn mq_receive(
-        mqd: ::mqd_t,
-        msg_ptr: *mut ::c_char,
-        msg_len: ::size_t,
-        msg_prio: *mut ::c_uint,
-    ) -> ::ssize_t;
-    pub fn mq_send(
-        mqd: ::mqd_t,
-        msg_ptr: *const ::c_char,
-        msg_len: ::size_t,
-        msg_prio: ::c_uint,
-    ) -> ::c_int;
-    pub fn mq_setattr(
-        mqd: ::mqd_t,
-        newattr: *const ::mq_attr,
-        oldattr: *mut ::mq_attr,
-    ) -> ::c_int;
-    pub fn mq_timedreceive(
-        mqd: ::mqd_t,
-        msg_ptr: *mut ::c_char,
-        msg_len: ::size_t,
-        msg_prio: *mut ::c_uint,
-        abs_timeout: *const ::timespec,
-    ) -> ::ssize_t;
-    pub fn mq_timedsend(
-        mqd: ::mqd_t,
-        msg_ptr: *const ::c_char,
-        msg_len: ::size_t,
-        msg_prio: ::c_uint,
-        abs_timeout: *const ::timespec,
-    ) -> ::c_int;
-    pub fn mq_unlink(name: *const ::c_char) -> ::c_int;
     pub fn mincore(
         addr: *const ::c_void,
         len: ::size_t,
@@ -1517,6 +1469,58 @@ extern "C" {
     pub fn ntp_gettime(buf: *mut ntptimeval) -> ::c_int;
 }
 
+#[link(name = "rt")]
+extern "C" {
+    pub fn aio_read(aiocbp: *mut aiocb) -> ::c_int;
+    pub fn aio_write(aiocbp: *mut aiocb) -> ::c_int;
+    pub fn aio_fsync(op: ::c_int, aiocbp: *mut aiocb) -> ::c_int;
+    pub fn aio_error(aiocbp: *const aiocb) -> ::c_int;
+    pub fn aio_return(aiocbp: *mut aiocb) -> ::ssize_t;
+    pub fn aio_suspend(
+        aiocb_list: *const *const aiocb,
+        nitems: ::c_int,
+        timeout: *const ::timespec,
+    ) -> ::c_int;
+    pub fn aio_cancel(fd: ::c_int, aiocbp: *mut aiocb) -> ::c_int;
+    pub fn mq_close(mqd: ::mqd_t) -> ::c_int;
+    pub fn mq_getattr(mqd: ::mqd_t, attr: *mut ::mq_attr) -> ::c_int;
+    pub fn mq_notify(mqd: ::mqd_t, notification: *const ::sigevent)
+        -> ::c_int;
+    pub fn mq_open(name: *const ::c_char, oflag: ::c_int, ...) -> ::mqd_t;
+    pub fn mq_receive(
+        mqd: ::mqd_t,
+        msg_ptr: *mut ::c_char,
+        msg_len: ::size_t,
+        msg_prio: *mut ::c_uint,
+    ) -> ::ssize_t;
+    pub fn mq_send(
+        mqd: ::mqd_t,
+        msg_ptr: *const ::c_char,
+        msg_len: ::size_t,
+        msg_prio: ::c_uint,
+    ) -> ::c_int;
+    pub fn mq_setattr(
+        mqd: ::mqd_t,
+        newattr: *const ::mq_attr,
+        oldattr: *mut ::mq_attr,
+    ) -> ::c_int;
+    pub fn mq_timedreceive(
+        mqd: ::mqd_t,
+        msg_ptr: *mut ::c_char,
+        msg_len: ::size_t,
+        msg_prio: *mut ::c_uint,
+        abs_timeout: *const ::timespec,
+    ) -> ::ssize_t;
+    pub fn mq_timedsend(
+        mqd: ::mqd_t,
+        msg_ptr: *const ::c_char,
+        msg_len: ::size_t,
+        msg_prio: ::c_uint,
+        abs_timeout: *const ::timespec,
+    ) -> ::c_int;
+    pub fn mq_unlink(name: *const ::c_char) -> ::c_int;
+}
+
 #[link(name = "util")]
 extern "C" {
     pub fn openpty(