(font_score): Delete arg alternate_families. Check only
weight, slant, width, and size. (font_sort_entites): Adjusted for the above change. Reflect the order of font-driver to scores. (font_list_entities): Don't check alternate_familes here. (font_clear_prop): Handle foundry. (font_update_lface): Don't parse "foundry-family" form here. Handle FONT_FOUNDRY_INDEX. (font_find_for_lface): Likewise. Handle alternate families here. (font_open_for_lface): Pay attention to size in ENTITY. (font_open_by_name): Simplified by calling font_load_for_lface. (free_font_driver_list): Delete it. (font_update_drivers): Preserve the order of backends. (syms_of_font): Setting of sort_shift_bits adjusted for the change of font_score and font_sort_entites.
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