Fix CI, Add signal.h constants

src/platform/linux/signal.rs

@@ -124,8 +124,12 @@ impl PalSignal for Sys {
 
     fn sigsuspend(mask: &sigset_t) -> Errno {
         unsafe {
-            e_raw(syscall!(RT_SIGSUSPEND, mask as *const sigset_t, NSIG / 8))
-                .expect_err("must fail")
+            e_raw(syscall!(
+                RT_SIGSUSPEND,
+                mask as *const sigset_t,
+                size_of::<sigset_t>()
+            ))
+            .expect_err("must fail")
         }
     }
 
@@ -140,7 +144,7 @@ impl PalSignal for Sys {
                 set as *const _,
                 sig.map_or_else(core::ptr::null_mut, |s| s as *mut _),
                 tp.map_or_else(core::ptr::null, |t| t as *const _),
-                NSIG / 8
+                size_of::<sigset_t>()
             ))
             .map(|_| ())
         }