C++: Uncomment more preprocessor tests

[jketema]

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• cpp/ql/test/library-tests/preprocessor/preprocessor/pp.cpp: Language not supported
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[geoffw0]

LGTM.

I assume these macros were causing something terrible to happen at some point previously.

[jketema]

I assume these macros were causing something terrible to happen at some point previously.

That's what I suspect too.