Fix broken ap_config.h generation by avoiding nested function calls which some

braindead AWK's (like Solaris 2.6 awk) dislike.

PR: 2139


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@81045 13f79535-47bb-0310-9956-ffa450edef68