orafce - orafce: Add uninstaller for decode(bpchar).

Log Message:
-----------
Add uninstaller for decode(bpchar).

Modified Files:
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orafce:
orafunc.sql.in (r1.53 -> r1.54)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/orafunc.sql.in.diff?r1=1.53&r2=1.54)
uninstall_orafunc.sql (r1.4 -> r1.5)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/orafce/orafce/uninstall_orafunc.sql.diff?r1=1.4&r2=1.5)