[issue27659] Check for the existence of crypt()

[Martin Panter]

Martin Panter added the comment:

If there is an obscure platform where we don’t include the right header file for a function, changing the warning into an error would cause the build to fail. If we do make it an error, it should only be so for 3.7.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27659>
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