make help: warn about missing Makefile.cfg
make help: warn about missing Makefile.cfg

git-svn-id: f68c6b3b1dcd5d00a2560c384475aaef3bc99487@10132 af82e41b-90c4-0310-8c96-b1721e28e2e2

dafrito/trac-mirror,dafrito/trac-mirror,dafrito/trac-mirror,dafrito/trac-mirror