[issue27659] Check for the existence of crypt()

[Chi Hsuan Yen]

Chi Hsuan Yen added the comment:

Some references for crypt():

POSIX standard: http://pubs.opengroup.org/onlinepubs/9699919799/functions/crypt.html
Linux man page: http://man7.org/linux/man-pages/man3/crypt.3.html
FreeBSD man page: https://www.freebsd.org/cgi/man.cgi?crypt(3)
Mac OS X man page: https://developer.apple.com/library/ios/documentation/System/Conceptual/ManPages_iPhoneOS/man3/crypt.3.html

All requires <unistd.h>.

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<http://bugs.python.org/issue27659>
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