Log Message:
Update libotf to 0.9.11.

* Changes in libotf 0.9.11

** New functions OTF_drive_gsub_with_log and OTF_drive_gpos_with_log
works like OTF_drive_gsub and OTF_drive_gpos but also records which
features are applied to which glyphs.

** New function OTF_put_data and OTF_get_data can be used to store and
retrieve arbitrary cliend data to/from the structure OTF.