pgbouncer - pgbouncer: Fix the quoting fix.

Log Message:
-----------
Fix the quoting fix.

If we treat "" as special, we need to know
whether we are in quoted string or not.

Otherwise empty field ("") throws the parser off.

Modified Files:
--------------
pgbouncer/src:
loader.c (r1.22 -> r1.23)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgbouncer/pgbouncer/src/loader.c?r1=1.22&r2=1.23)