Fix `make r' test procedure in src/regex/: ap_isprint was not found.

Additionally get rid of some warnings given by EGCS.

PR: 4561, 4562


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@83407 13f79535-47bb-0310-9956-ffa450edef68