fix SDL_config.h errors on older glibc #28
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glibc 2.37 and earlier does not support wcslcpy, wcslcat, strlcpy, and strlcat. Without implementing a more sophisticated detection, it is simpler to enable SDL's fallback functions for these often missing routines. example of affected systems: Linux Mint 21.3 and earlier Debian 12 (bookworm) and earlier Ubuntu 22.10 (kinetic) and earlier Fedora 37 and earlier Zorin 17.3 and earlier Also, updates README.md with some basic instructions.
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glibc 2.37 and earlier does not support wcslcpy, wcslcat, strlcpy, and strlcat.
Without implementing a more sophisticated detection, it is simpler to enable SDL's fallback functions for these often missing routines.
example of affected systems:
Linux Mint 21.3 and earlier
Debian 12 (bookworm) and earlier
Ubuntu 22.10 (kinetic) and earlier
Fedora 37 and earlier
Zorin 17.3 and earlier
Also, updates README.md with some basic instructions.