Temporarily disable tests on anything but macosx

They brake multiple bots.

rdar://144000451

Author: aschwaighofer

test/Interop/Cxx/library-evolution/allow-c-in-cxx-mode-in-evolving-libraries.swift

@@ -2,6 +2,8 @@
 // RUN: split-file %s %t
 // RUN: %target-swift-frontend %t/test.swift -I %t/Inputs -typecheck -enable-library-evolution -enable-experimental-cxx-interop -verify
 
+// REQUIRES: OS=macosx
+
 //--- Inputs/module.modulemap
 module CxxModule {
     header "header.h"

test/Interop/Cxx/library-evolution/allow-objc-in-cxx-mode-in-evolving-libraries.swift

@@ -3,6 +3,7 @@
 // RUN: %target-swift-frontend %t/test.swift -I %t/Inputs -typecheck -enable-library-evolution -enable-experimental-cxx-interop -verify
 
 // REQUIRES: objc_interop
+// REQUIRES: OS=macosx
 
 //--- Inputs/module.modulemap
 module ObjCxxModule {

test/Interop/Cxx/library-evolution/prohibit-cxx-api-in-evolving-libraries.swift

@@ -1,7 +1,9 @@
 // RUN: %empty-directory(%t)
 // RUN: split-file %s %t
 // RUN: %target-swift-frontend %t/test.swift -I %t/Inputs -typecheck -enable-library-evolution -enable-experimental-cxx-interop -disable-availability-checking -disable-implicit-cxx-module-import -verify
- 
+
+// REQUIRES: OS=macosx
+
 //--- Inputs/module.modulemap
 module CxxModule {
     header "header.h"

test/Interop/Cxx/library-evolution/prohibit-cxx-calls-in-evolving-inlinable-bodies.swift

@@ -2,6 +2,8 @@
 // RUN: split-file %s %t
 // RUN: %target-swift-frontend %t/test.swift -I %t/Inputs -typecheck -enable-library-evolution -enable-experimental-cxx-interop -disable-implicit-cxx-module-import -verify
 
+// REQUIRES: OS=macosx
+
 //--- Inputs/module.modulemap
 module CxxModule {
     header "header.h"