fix: fix failing test when crypt is missing. In 3.13 crypt is gone and there is no replacement as it's supplied by a .so as _crypt. Don't hardcode the crypt method in the array, add it (next to last) only if crypt was detected.

#!/usr/bin/env python
from __future__ import print_function
import zlib, base64, sys
print(base64.encodestring(zlib.compress(sys.stdin.read())))