Try to skip some tests

Lots of stdlib tests are trying to run freestanding, which is not supported by Darwin, and not supported by all of the private unit test modules either. Try adding some UNSUPPORTED markup for the Apple OSes && freestanding to see if I have the syntax right.

Author: ian-twilightcoder

test/Concurrency/CaseIterableIsolation.swift

@@ -3,6 +3,10 @@
 
 // REQUIRES: executable_test
 // REQUIRES: concurrency
+// UNSUPPORTED: OS=macosx && freestanding
+// UNSUPPORTED: OS=ios && freestanding
+// UNSUPPORTED: OS=tvos && freestanding
+// UNSUPPORTED: OS=watchos && freestanding
 
 import StdlibUnittest
 

test/Concurrency/Runtime/actor_keypaths.swift

@@ -4,6 +4,10 @@
 // REQUIRES: concurrency
 // REQUIRES: concurrency_runtime
 // UNSUPPORTED: back_deployment_runtime
+// UNSUPPORTED: OS=macosx && freestanding
+// UNSUPPORTED: OS=ios && freestanding
+// UNSUPPORTED: OS=tvos && freestanding
+// UNSUPPORTED: OS=watchos && freestanding
 
 actor Page {
     let initialNumWords : Int

test/Concurrency/Runtime/clock.swift

@@ -9,6 +9,10 @@
 // in the back deployment runtime.
 // UNSUPPORTED: back_deployment_runtime
 // UNSUPPORTED: back_deploy_concurrency
+// UNSUPPORTED: OS=macosx && freestanding
+// UNSUPPORTED: OS=ios && freestanding
+// UNSUPPORTED: OS=tvos && freestanding
+// UNSUPPORTED: OS=watchos && freestanding
 
 import _Concurrency
 import StdlibUnittest

test/Concurrency/Runtime/reasync.swift

@@ -6,6 +6,10 @@
 
 // REQUIRES: executable_test
 // REQUIRES: concurrency
+// UNSUPPORTED: OS=macosx && freestanding
+// UNSUPPORTED: OS=ios && freestanding
+// UNSUPPORTED: OS=tvos && freestanding
+// UNSUPPORTED: OS=watchos && freestanding
 
 import StdlibUnittest
 import reasync

test/stdlib/AllocRounding.swift

@@ -1,5 +1,9 @@
 // RUN: %target-run-simple-swift
 // REQUIRES: executable_test
+// UNSUPPORTED: OS=macosx && freestanding
+// UNSUPPORTED: OS=ios && freestanding
+// UNSUPPORTED: OS=tvos && freestanding
+// UNSUPPORTED: OS=watchos && freestanding
 
 import StdlibUnittest
 

test/stdlib/Builtins.swift

@@ -15,6 +15,10 @@
 // RUN: %target-codesign %t/Builtins
 // RUN: %target-run %t/Builtins
 // REQUIRES: executable_test
+// UNSUPPORTED: OS=macosx && freestanding
+// UNSUPPORTED: OS=ios && freestanding
+// UNSUPPORTED: OS=tvos && freestanding
+// UNSUPPORTED: OS=watchos && freestanding
 
 import Swift
 import SwiftShims