Whether the find_library() command should automatically search lib32 directories.
FIND_LIBRARY_USE_LIB32_PATHS is a boolean specifying whether the find_library() command should automatically search the lib32 variant of directories called lib in the search path when building 32-bit binaries.
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https://cmake.org/cmake/help/v3.7/prop_gbl/FIND_LIBRARY_USE_LIB32_PATHS.html