Log Message:
-----------
Remove old *.backup files when we do pg_stop_backup(). This
prevents a large number of *.backup files from existing in pg_xlog/
Modified Files:
--------------
pgsql/src/backend/access/transam:
xlog.c (r1.199 -> r1.200)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xlog.c.diff?r1=1.199&r2=1.200)