[breaking change] sigaction.sa_flags changed from c_ulong to c_int on 32-bit Android

src/unix/notbsd/android/b32/mod.rs

@@ -13,7 +13,7 @@ s! {
     pub struct sigaction {
         pub sa_sigaction: ::sighandler_t,
         pub sa_mask: ::sigset_t,
-        pub sa_flags: ::c_ulong,
+        pub sa_flags: ::c_int,
         pub sa_restorer: ::Option<extern fn()>,
     }