Log Message:
-----------
Fix the build for when SHOW_MEMORY_STATS is defined. The reference to
the nonexistent ShowStats variable is simply removed, per Gavin Sherry.
Modified Files:
--------------
pgsql/src/backend/tcop:
postgres.c (r1.518 -> r1.519)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/postgres.c.diff?r1=1.518&r2=1.519)