fa32f4cd75
We require at least crypt_r() exists, and it is provided since glibc-2.0 (and dropped in glibc-2.39) or by libxcrypt, and the function is provided in crypt.h regardless it is provided by glibc or libxcrypt. Hence, we cannot fallback to unistd.h. This makes the condition about crypt.h more strict, and stop compilation earlier when crypt.h does not exist.
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