Add missing /contrib files to CVS.

contrib/lo/lo_drop.sql

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+--
+-- This removes the type (and a test table)
+-- It's used just for development
+--
+
+-- remove our test table
+drop table a;
+
+-- now drop any sql based functions associated with the lo type
+drop function oid(lo);
+
+-- now drop the type
+drop type lo;
+
+-- as the type is gone, remove the C based functions
+drop function lo_in(opaque);
+drop function lo_out(opaque);
+drop function lo(oid);
+drop function lo_manage();
+
+-- the lo stuff is now removed from the system