Log Message:
Update to 0.9.9:

* Changes in libotf 0.9.9

** New function OTF_get_variation_glyphs returns glyphs selected by
variation selectors.

** The funciton OTF_drive_cmap handles a variation selector.

** The example program `otfview' can handle variation selectors.

** The function OTF_drive_gpos is obsolte now, and the new function
OTF_drive_gpos2 should be used instead.  See the comment of the member
"glyph_id" of type "OTF_Glyph" for the detail.

** If a font doesn't have GDEF table, automatically synthesized GDEF
table is used.