pgsql: Quote pathnames so pg_standby works with paths that have spaces

Log Message:
-----------
Quote pathnames so pg_standby works with paths that have
spaces in them.

ISHIDA Akio

Modified Files:
--------------
pgsql/contrib/pg_standby:
pg_standby.c (r1.7 -> r1.8)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_standby/pg_standby.c.diff?r1=1.7&r2=1.8)