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(fontset_font, fontset_ascii, face_for_char)
(make_fontset_for_ascii_face, Ffont_info)
(Finternal_char_font) [USE_FONT_BACKEND]: If enable_font_backend
is nonzero, use font-backend mechanism.
(find_font_encoding): Make it non-static.
(new_fontset_from_font, fontset_ascii_font) [USE_FONT_BACKEND]:
New functions.