Module Makefiles generated by Configure do not remove shared

library files (.so). Also they remove "*.o" which could delete
object files not part of Apache. Ensure that make clean in module
directories only removes Apache-built object and shared-libraries.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80343 13f79535-47bb-0310-9956-ffa450edef68