Change --debug flag to 'store_true'
Change --debug flag to 'store_true'

It should have been this way to begin with.

BUG= https://code.google.com/p/naclports/issues/detail?id=197
R=binji@chromium.org

Review URL: https://codereview.chromium.org/1001373003

Schibum/naclports,Schibum/naclports,Schibum/naclports,Schibum/naclports,yeyus/naclports,yeyus/naclports,Schibum/naclports,yeyus/naclports,yeyus/naclports,Schibum/naclports,yeyus/naclports,yeyus/naclports