(mfont__ft_drive_otf): Set g->combining_code to a precomupted combining code.
(mfont__ft_drive_otf): Set g->combining_code to a
precomupted combining code.

xmirror/m17n-lib,xmirror/m17n-lib,xmirror/m17n-lib,xmirror/m17n-lib