Why should we include sys/signal.h? That is bogus.

Also, explicitly cast crypt() return to char*.  We should include the
right header file (ie. crypt.h), but that is painful right now.

These both follow existing practice in other parts of the code.

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80587 13f79535-47bb-0310-9956-ffa450edef68