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7e2707e2af
Fixed 'minimal' builds. Various obviously useful minimal configurations don't build because of missing contrib/libtests test programs and overly complex dependencies in scripts/pnglibconf.dfa. This change adds contrib/conftest/*.dfa files that can be used in automatic build scripts to ensure that these configurations continue to build. Enabled WRITE_INVERT and WRITE_PACK in contrib/pngminim/encoder.
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.