pgbouncer - pgbouncer: partial support for builddir != srcdir

Log Message:
-----------
partial support for builddir != srcdir

Modified Files:
--------------
pgbouncer:
Makefile (r1.19 -> r1.20)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/Makefile.diff?r1=1.19&r2=1.20)
configure.ac (r1.25 -> r1.26)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/configure.ac.diff?r1=1.25&r2=1.26)