license: Check skip flag instead of 'virtual' categories.

Fix a bug in which a loop was only skipping packages with a virtual
category, when it should be skipping all packages marked 'skip'.

BUG=chromium:416697
TEST=Ran script locally.

Change-Id: I063a88b8c5fece4ef06a755b2efa816736824099
Reviewed-on: https://chromium-review.googlesource.com/219422
Tested-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Don Garrett <dgarrett@chromium.org>
1 file changed