UnitTests: Skip PageFaultTest if exception handlers are not supported

Page faults should only occur on architectures that support exception
handlers, so skip the test on other architectures to avoid spurious test
failures.

Source/Core/Core/MemTools.h

@@ -7,4 +7,5 @@ namespace EMM
 {
 void InstallExceptionHandler();
 void UninstallExceptionHandler();
+bool IsExceptionHandlerSupported();
 }  // namespace EMM