Fix make distclean and make clean. Before this commit, we only cleaned

directories that have been configured by the last call to ./configure.
This means that if somebody does ./configure --with-mpm=dexter;make and
then ./configure --with-mpm=prefork;make and then make distclean, dexter
doesn't get cleaned up.  Same thing goes for clean.

All this does is with distclean and clean, after we have recursively
gone through the tree to clean everything, we do a quick find to get all
of the left-over Makefiles.  Then we just do the same operation on those
directories.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85773 13f79535-47bb-0310-9956-ffa450edef68