pgsql: Adjust with-system-tzdata patch to not attempt to install a

Log Message:
-----------
Adjust with-system-tzdata patch to not attempt to install a symlink,
but just hardwire the specified timezone database path into the executable.
Per discussion, this avoids some packaging disadvantages of using a
symlink.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        installation.sgml (r1.291 -> r1.292)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/installation.sgml?r1=1.291&r2=1.292)
    pgsql/src/timezone:
        Makefile (r1.27 -> r1.28)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/Makefile?r1=1.27&r2=1.28)
        pgtz.c (r1.53 -> r1.54)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/pgtz.c?r1=1.53&r2=1.54)