set type 'settings' to 'none' in gyp file in case using the system lib

Contributed by robert.nagy@gmail.com

BUG=None
TEST=None
Review URL: http://codereview.chromium.org/8692003

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/speex@111570 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed