Jackie Ng d70c4e356c [gdal] Fix linker error with static libpng (#6305)
* When linking gdal with static libpng, it fails because the libpng vcpkg port has references to zlib symbols that aren't present in the internal copy of zlib that gdal builds/links against.

To fix this, have the gdal port pull in a vcpkg zlib port as another dependency and have it build/link against that instead.

* [gdal]: Bump portfile version as master is already at 2.4.1-2
2019-05-06 10:44:27 -07:00
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