Log Message:-----------let make clean work even if config.mak does not exist
Modified Files:-------------- pgbouncer: Makefile (r1.20 -> r1.21) (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/Makefile.diff?r1=1.20&r2=1.21)
