Apply skipUnlessDarwin decorator

Author: kastiglione

lldb/test/API/commands/dwim-print/objc/TestDWIMPrintObjC.py

@@ -9,6 +9,7 @@
 
 
 class TestCase(TestBase):
+    @skipUnlessDarwin
     def test(self):
         self.build()
         lldbutil.run_to_source_breakpoint(self, "break here", lldb.SBFileSpec("main.m"))