WL#4676: Add bitfield condition push support to handler

The fix to BUG#40535 fixes the NdbScanFilter functionality w.r.t. BIT columns,
and also adds some new bitfield comparison operators to mysql-5.1-telco-6.3.

The condition pushdown mechanism in the Ndb handler could be extended to make
use of this to push down SQL conditions based on BIT columns.