License of GL2D

The current license of GL2D is a custom license: https://github.com/blocksds/libnds/blob/d209d6c7b5f7f76462e7977042ca32b5ed80026c/licenses/gl2d.txt https://github.com/blocksds/libnds/blob/d209d6c7b5f7f76462e7977042ca32b5ed80026c/source/arm9/video/gl2d.c https://github.com/blocksds/libnds/blob/d209d6c7b5f7f76462e7977042ca32b5ed80026c/include/gl2d.h Ideally, all the code in this repository would be Zlib. @relminator Would you be okay with relicensing the files under the Zlib license? All that license forces you to do is to keep the copyright notice in source files, but it's not needed in binary files.