(PACK_OTF_TAG) [M17N_FLT_USE_NEW_FEATURE]: New macro.
(ftfont_drive_otf) [M17N_FLT_USE_NEW_FEATURE]: Handle the case
that OUT is NULL. Use OTF_drive_gsub_with_log and
OTF_drive_gpos_with_log instead of OTF_drive_gsub and
OTF_drive_gpos.
(ftfont_try_otf) [M17N_FLT_USE_NEW_FEATURE]: New function.
(PACK_OTF_TAG) [M17N_FLT_USE_NEW_FEATURE]: New macro.
(ftfont_drive_otf) [M17N_FLT_USE_NEW_FEATURE]: Handle the case
that OUT is NULL. Use OTF_drive_gsub_with_log and
OTF_drive_gpos_with_log instead of OTF_drive_gsub and
OTF_drive_gpos.
(ftfont_try_otf) [M17N_FLT_USE_NEW_FEATURE]: New function.