6f9ecc Only set the environment variable PKG_CONFIG_LIBDIR in the cmake macros

Authored and Committed by epienbro 6 years ago
    Only set the environment variable PKG_CONFIG_LIBDIR in the cmake macros
    
    - Only set the environment variable PKG_CONFIG_LIBDIR when
      using the macros %mingw32_cmake, %mingw32_cmake_kde4,
      %mingw64_cmake or %mingw64_cmake_kde4
    - Fixes FTBFS of the mingw-matahari package
    
        
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