Fix configuration engine re-entrant hangups, which solve a

handful of problems seen with mod_perl <Perl> configuration sections

PR:
Obtained from:
Submitted by:	Salvador Ortiz Garcia <sog@msg.com.mx>
Reviewed by:	Doug, Dean


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@83190 13f79535-47bb-0310-9956-ffa450edef68