pgsql-server: Suppress timezone output on log_line_prefix %t on Win32,

Log Message:
-----------
Suppress timezone output on log_line_prefix %t on Win32, because it is
too long.

Modified Files:
--------------
pgsql-server/src/backend/utils/error:
elog.c (r1.152 -> r1.153)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/error/elog.c.diff?r1=1.152&r2=1.153)