fix gcc 5.4 warnings

Jan Willamowius

2019-04-22 ee2a290abf16f4fd4736c2f4e17e9cff87f50447

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enable_language(CXX)
add_subdirectory("base_lib")
add_subdirectory("bootstrap")
add_subdirectory("pc-identifier")
add_subdirectory("license-generator")