Travis:  Temporarily disable Windows build/test.
Travis:  Temporarily disable Windows build/test.

Travis times out jobs that continue beyond a time limit (~1 hour).
This change works around this condition, by disabling lesser-used
builds.

elecoin/elecoin,btc1/bitcoin,core-bitcoin/bitcoin,btc1/bitcoin,elecoin/elecoin,elecoin/elecoin,btc1/bitcoin,btc1/bitcoin,core-bitcoin/bitcoin,btc1/bitcoin,core-bitcoin/bitcoin,core-bitcoin/bitcoin,elecoin/elecoin,elecoin/elecoin,core-bitcoin/bitcoin,core-bitcoin/bitcoin,btc1/bitcoin,elecoin/elecoin