pgbouncer - pgbouncer: remove the mc.exe detection, it not available

Log Message:
-----------
remove the mc.exe detection, it not available anyway

Modified Files:
--------------
pgbouncer:
Makefile (r1.27 -> r1.28)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/Makefile.diff?r1=1.27&r2=1.28)
config.mak.in (r1.7 -> r1.8)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/config.mak.in.diff?r1=1.7&r2=1.8)
configure.ac (r1.50 -> r1.51)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/configure.ac.diff?r1=1.50&r2=1.51)