Add rule for nfds_t

This makes the output on macos and linux be the same

Author: lucic71

rules/poll/src.cpp

@@ -4,6 +4,7 @@
 #include <poll.h>
 
 typedef struct pollfd t1;
+typedef nfds_t t2;
 
 int f1(struct pollfd *fds, nfds_t nfds, int timeout) {
   return poll(fds, nfds, timeout);

rules/poll/tgt_unsafe.rs

@@ -5,6 +5,10 @@ fn t1() -> ::libc::pollfd {
     unsafe { std::mem::zeroed() }
 }
 
-unsafe fn f1(a0: *mut ::libc::pollfd, a1: u64, a2: i32) -> i32 {
+fn t2() -> ::libc::nfds_t {
+    0
+}
+
+unsafe fn f1(a0: *mut ::libc::pollfd, a1: ::libc::nfds_t, a2: i32) -> i32 {
     libc::poll(a0, a1 as ::libc::nfds_t, a2)
 }

tests/unit/out/refcount/poll.rs

@@ -64,7 +64,7 @@ fn main_0() -> i32 {
             let mut __idx = Vec::new();
             let mut __wanted = Vec::new();
             let mut __events = Vec::new();
-            for __i in 0..(2_u64 as usize) {
+            for __i in 0..((2 as ::libc::nfds_t) as usize) {
                 let (__fd, __ev) = __p
                     .offset(__i)
                     .with(|__e| (*__e.fd.borrow(), *__e.events.borrow()));

tests/unit/out/unsafe/poll.rs

@@ -29,7 +29,11 @@ unsafe fn main_0() -> i32 {
     pfd[(1) as usize].fd = -1_i32;
     pfd[(1) as usize].events = 1_i16;
     pfd[(1) as usize].revents = 42_i16;
-    assert!(((((libc::poll(pfd.as_mut_ptr(), 2_u64 as ::libc::nfds_t, 0)) == (1)) as i32) != 0));
+    assert!(
+        ((((libc::poll(pfd.as_mut_ptr(), (2 as ::libc::nfds_t) as ::libc::nfds_t, 0)) == (1))
+            as i32)
+            != 0)
+    );
     assert!((((((pfd[(0) as usize].revents as i32) & (1)) != (0)) as i32) != 0));
     assert!(((((pfd[(1) as usize].revents as i32) == (0)) as i32) != 0));
     let mut ch: libc::c_char = (0 as libc::c_char);