libcrypt was no longer built by default since glibc-2.38, and it has been completely removed since glibc-2.39. Let's always use libxcrypt, unless when building with musl. As already major distribution already have libxcrypt-4.4.x, hence let's also bump the required minimum version to 4.4.0. libxcrypt cannot be built with musl, hence the previous fallback logic in libcrypt-util.c are moved to musl/crypt.c. Note, libxcrypt-4.4.0 was released on 2018-11-20. See also #38608.
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