Accept that in --batch mode. Also in batch mode don't send the 0th arg. Related discussion: https://github.com/harfbuzz/harfbuzz/pull/3102
Enabled if script tag 'Qaag' is passed to HarfBuzz. Disables mark advance-zeroing and fallback mark-positioning. Fixes https://github.com/harfbuzz/harfbuzz/issues/1162