The crypt() prototype is in <unistd.h> instead of <crypt.h>

on HP-UX.  We had no prototype for crypt() there.
In 64-bit mode, a crash occurred because the pointer 
returned by crypt() was truncated before we passed
the pointer to apr_cpystrn().


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@393364 13f79535-47bb-0310-9956-ffa450edef68