extlibs/png: ensure to use the internal copy of zlib

Galladite27 / ONScripter-EN

Continuation of ONScripter-EN with updated dependencies and more features and bugfixes. Also see onscripter-insani (https://github.com/insani-org/onscripter-insani), our sister project.

http://galladite.net/~galladite/ons-en/

GNU General Public License v2.0

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extlibs/png: ensure to use the internal copy of zlib #59

Closed SeanMcG closed 3 weeks ago

SeanMcG commented 3 weeks ago

zlib-1.2.3 does not include a pkgconfig script, so we have to force this here in order to not use the system libraries.