Log Message:
-----------
Prevent multiple archivers from starting. Backpatch to 8.1.X.
Simon Riggs
Modified Files:
--------------
pgsql/src/backend/postmaster:
pgarch.c (r1.20 -> r1.21)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/pgarch.c.diff?r1=1.20&r2=1.21)