Expose ppoll on some BSDs

Author: Susurrus

src/unix/bsd/freebsdlike/mod.rs

@@ -922,6 +922,10 @@ extern {
     pub fn pthread_mutex_timedlock(lock: *mut pthread_mutex_t,
                                    abstime: *const ::timespec) -> ::c_int;
     pub fn pipe2(fds: *mut ::c_int, flags: ::c_int) -> ::c_int;
+    pub fn ppoll(fds: *mut ::pollfd,
+                 nfds: nfds_t,
+                 timeout: *const ::timespec,
+                 sigmask: *const sigset_t) -> ::c_int;
 }
 
 cfg_if! {