bin2c: Support mman/mmap-less platforms (MSYS2) #583
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Fixes a regression for the MSYS2 platform from #538
For whatever reason, mman support for MSYS2 was refused and they've been mman-less ever since.
I kept the LUT for the MSYS2 platform, but fell back to the generic posix read/write functions for IO. There's memory mapping support through the win32 api, but I don't it's worth implementing for this (hopefully-soon-to-be-abandoned) platform.
Also, I don't know why the formatting changed. I've run the file through clang-format.