tests: adjust inputs for Windows

Windows does not have unsigned enumerations by default.  Use a typed
enum to ensure that we get unsigned enumerations on Windows.  Fixes the
handling for tests on Windows.

Author: compnerd

test/IRGen/Inputs/usr/include/Gizmo.h

@@ -129,11 +129,19 @@ typedef NS_ENUM(unsigned, NeverActuallyMentionedByName) {
 - (NeverActuallyMentionedByName)getValue;
 @end
 
+#if defined(_WIN32)
+enum RawEnumInGizmo : unsigned {
+  InGizmoOne=0x7FFFFFFF,
+  InGizmoTwo,
+  InGizmoThree
+};
+#else
 enum RawEnumInGizmo {
   InGizmoOne=0x7FFFFFFF,
   InGizmoTwo,
   InGizmoThree
 };
+#endif
 
 struct StructOfNSStrings {
   __unsafe_unretained NSString *a;