More cfg cleanups. (#550)

* More `cfg` cleanups.

Use the new OS feature groups in more places.

Author: sunfishcode

examples/process.rs

@@ -48,24 +48,17 @@ fn main() -> io::Result<()> {
         println!("Stack Limit: {:?}", getrlimit(Resource::Stack));
         #[cfg(not(target_os = "haiku"))]
         println!("Core Limit: {:?}", getrlimit(Resource::Core));
-        #[cfg(not(any(target_os = "haiku", target_os = "illumos", target_os = "solaris")))]
+        #[cfg(not(any(solarish, target_os = "haiku")))]
         println!("Rss Limit: {:?}", getrlimit(Resource::Rss));
-        #[cfg(not(any(target_os = "haiku", target_os = "illumos", target_os = "solaris")))]
+        #[cfg(not(any(solarish, target_os = "haiku")))]
         println!("Nproc Limit: {:?}", getrlimit(Resource::Nproc));
         #[cfg(not(target_os = "solaris"))]
         println!("Nofile Limit: {:?}", getrlimit(Resource::Nofile));
-        #[cfg(not(any(target_os = "haiku", target_os = "illumos", target_os = "solaris")))]
+        #[cfg(not(any(solarish, target_os = "haiku")))]
         println!("Memlock Limit: {:?}", getrlimit(Resource::Memlock));
         #[cfg(not(target_os = "openbsd"))]
         println!("As Limit: {:?}", getrlimit(Resource::As));
-        #[cfg(not(any(
-            apple,
-            freebsdlike,
-            solarish,
-            target_os = "haiku",
-            target_os = "netbsd",
-            target_os = "openbsd",
-        )))]
+        #[cfg(not(any(bsd, solarish, target_os = "haiku")))]
         println!("Locks Limit: {:?}", getrlimit(Resource::Locks));
         #[cfg(not(any(bsd, solarish, target_os = "haiku")))]
         println!("Sigpending Limit: {:?}", getrlimit(Resource::Sigpending));