Tweak modules Makefile generated by Configure so that it handles

the test case of no modules being selected.

Submitted by:	chaz@reliant.com
Reviewed by:	Roy Fielding, Jim Jagielski


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82785 13f79535-47bb-0310-9956-ffa450edef68