Make more of the test suite run on Mac Catalyst

This adds the `only-apple`/`ignore-apple` compiletest directive, and
uses that basically everywhere instead of `only-macos`/`ignore-macos`.

Some of the updates in `run-make` are a bit redundant, as they use
`ignore-cross-compile` and won't run on iOS - but using Apple in these
is still more correct, so I've made that change anyhow.

std/src/fs/tests.rs

@@ -1431,7 +1431,7 @@ fn metadata_access_times() {
     assert_eq!(check!(a.modified()), check!(a.modified()));
     assert_eq!(check!(b.accessed()), check!(b.modified()));
 
-    if cfg!(target_os = "macos") || cfg!(target_os = "windows") {
+    if cfg!(target_vendor = "apple") || cfg!(target_os = "windows") {
         check!(a.created());
         check!(b.created());
     }