* Replace libpng submodule with source Taken from 505e70834d35383537b6491e7ae8641f1a4bed1876dbfe361201fc80868d88ca libpng-1.6.37.tar.xz * Remove submodule-related config from CI
This "contrib" directory contains contributions which are not necessarily under the libpng license, although all are open source. They are not part of libpng proper and are not used for building the library, although some are used for testing the library via "make check".