[embedded] Mark embedded/fno-builtin.swift as macOS only

Author: kubamracek

test/embedded/fno-builtin.swift

@@ -1,6 +1,10 @@
 // RUN: %target-swift-emit-ir %s %S/Inputs/print.swift -module-name main -Xcc -fno-builtin -enable-experimental-feature Embedded | %FileCheck %s
 // RUN: %target-swift-emit-ir %s %S/Inputs/print.swift -module-name main -Xcc -ffreestanding -enable-experimental-feature Embedded | %FileCheck %s
 
+// REQUIRES: swift_in_compiler
+// REQUIRES: VENDOR=apple
+// REQUIRES: OS=macosx
+
 public func foo() -> [Int] {
 	var a = [1, 2, 3]
 	a.append(4)