constified lib/cc API as much as possible. (trac #310)
git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac310@2748 e5f2f494-b856-4b98-b285-d166d9295462
git-svn-id: svn://bind10.isc.org/svn/bind10/branches/trac310@2748 e5f2f494-b856-4b98-b285-d166d9295462