Add MinGW support for assimp and freetype (#591)
* Add MinGW support for assimp and freetype
* Improve assimp package
* Improve freetype
* Rework assimp
* Add version 2.11.0 to freetype
* Rework freetype
* Remove build_framework option from assimp
* Assimp: Disable android option (android not yet supported)
* Freetype: Disable automatic fetch even when option is not enabled
* assimp: remove android option
* freetype: remove unused loop and fix code
* Assimp: Add extsources
* Fix freetype
* Final fix!
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