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Fix: sdl2-config would always be detected as present
The presence of sdl2-config is used go determine whether to look for sdl2 first, or just sdl1. However, when sdl2-config is *not* present, `which` returns an empty string. Due to lack of quoting, this produces `[ -x ]`, rather than `[ -x "" ]` and it turns out the former actually has a succesful exit status for some reason. This was not a problem when just running configure, because it would then just fail to detect sdl2 and fall back to sdl1. However, when passing `--with-sdl` (without specifying a version), this would only attempt to detect sdl2, even when sdl2-config was not present, but sdl1 is. Adding quotes makes the check work as intended.
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