* Replace libpng submodule with source Taken from 505e70834d35383537b6491e7ae8641f1a4bed1876dbfe361201fc80868d88ca libpng-1.6.37.tar.xz * Remove submodule-related config from CI
This demonstrates the use of PNG_USER_CONFIG, pngusr.h and pngusr.dfa to build minimal decoder, encoder, and progressive reader applications. See the individual README and pngusr.dfa files for more explanation.