pgsql: make initdb -U username work as advertised; back out bogus patch

Log Message:
-----------

make initdb -U username work as advertised; back out bogus patch at rev 1.42
and supply real fix for problem it tried to address.

Tags:
----
REL8_0_STABLE

Modified Files:
--------------
pgsql/src/bin/initdb:
initdb.c (r1.73.4.2 -> r1.73.4.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/initdb/initdb.c.diff?r1=1.73.4.2&r2=1.73.4.3)