DERBY-6491: Don't require USAGE priv on the datatypes of SELECTed columns; commit derby-6491-ab-stopRequiringUsagePriv.diff.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1573030 13f79535-47bb-0310-9956-ffa450edef68