`build.js`: Fix `getCompiler()` for offline use.
`build.js`: Fix `getCompiler()` for offline use.

`getCompiler()` should not wait for `saveETag()` if a connection
error occurs and the `response` event is never fired.

yetone/json3,bestiejs/json3,yetone/json3,jcoc611/cassandraMAP,bestiejs/json3,mcanthony/json3,jcoc611/cassandraMAP,mcanthony/json3