63765dd Define _vpath_builddir macro as `build`

Authored and Committed by mmarhefk 3 years ago
    Define _vpath_builddir macro as `build`
    
    SSG build system and tests count with build directory name `build`.
    For more details see:
    https://fedoraproject.org/wiki/Changes/CMake_to_do_out-of-source_builds
    
        
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