Fix logic for ignoring warnings in dictionary creation
Add -Wno-overlength-strings to all generated targets
When using clang the value for __clang__ is 1 and the value for __GNUC__ is 4, whereas in the GCC case __clang__ is not defined and __GNUC__ is the main compiler version, thus the logic has to be swapped. But since clang accepts #pragma GCC diagnostic ignored this does really change much.
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