Log Message:
Update to 6.11.1 (old distfiles disappeared). Ok brook.

Version 6.11.1 is the current release of the EPSG dataset,
distributed in an MS Access 97 database and/or as SQL scripts.
It incorporates data received and verified since the release of
Version 6.11 in August 2006.

pkgsrc fixes: SUBST_* improvements (was patching nonexistent file)