pgsql-server: Escape single quotes and backslashes used in locales

Log Message:
-----------
Escape single quotes and backslashes used in locales placed in
postgresql.conf.

Zhong Xubin

Modified Files:
--------------
pgsql-server/src/bin/initdb:
initdb.c (r1.56 -> r1.57)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/bin/initdb/initdb.c.diff?r1=1.56&r2=1.57)