Re-enable bootstrap on Travis
Re-enable bootstrap on Travis

It was broken because of the introduction of more granular control over the debug flags, and the testing for debug flags was not updated.
giuliolunati/ren-c,draegtun/ren-c,rgchris/ren-c,codebybrett/ren-c,rgchris/ren-c,kealist/ren-c,draegtun/ren-c,draegtun/ren-c,hostilefork/rebol,rgchris/ren-c,kealist/ren-c,codebybrett/ren-c,rgchris/ren-c,hostilefork/rebol,kealist/ren-c,giuliolunati/ren-c,kealist/ren-c,giuliolunati/ren-c,draegtun/ren-c,codebybrett/ren-c,kealist/ren-c,hostilefork/rebol,codebybrett/ren-c,hostilefork/rebol,draegtun/ren-c,codebybrett/ren-c,hostilefork/rebol,codebybrett/ren-c,hostilefork/rebol,giuliolunati/ren-c,kealist/ren-c,draegtun/ren-c,rgchris/ren-c,giuliolunati/ren-c