update buildupdate: add win geckofx and xulrunner

Add Windows GeckoFx and Xulrunner for complex non-roman script support

Update both scripts due to change in buildupdate generation code to
account for extracting xulrunner files from zip file.

Change-Id: I2271ff739002681d1b59c57936082b161c5d8758
Merge remote-tracking branch 'origin/develop' into wesay-gecko