Some distributions still use glibc's libcrypt. In that case, libcrypt.pc does not exist and dependency() will fail. Also, even if libxcrypt is used, there may not be a symlink from libcrypt.pc to libxcrypt.pc. So, let's add a secondary name. Follow-up for d625f717db6e151fd78742593c35eaba4cd2841d. Fixes #28289.
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