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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 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.