[lldb] Only run TestUniversal64 on macOS 11 and later

GreenDragon is running on a host OS and toolchain that doesn't support
building for Apple Silicon.

Author: JDevlieghere

lldb/test/API/macosx/universal64/TestUniversal64.py

@@ -25,14 +25,15 @@ def do_test(self):
 
     @skipUnlessDarwin
     @skipIfDarwinEmbedded
+    @skipIf(macos_version=["<", "11.0"])
     def test_universal64_executable(self):
         """Test fat64 universal executable"""
         self.build(debug_info="dsym")
         self.do_test()
 
     @skipUnlessDarwin
     @skipIfDarwinEmbedded
-    @skipIf(compiler="clang", compiler_version=['<', '7.0'])
+    @skipIf(macos_version=["<", "11.0"])
     def test_universal64_dsym(self):
         """Test fat64 universal dSYM"""
         self.build(debug_info="dsym", dictionary={'FAT64_DSYM': '1'})