(xfont_chars_supported, xfont_supported_scripts): New
functions.
(xfont_scripts_cache, xfont_scratch_props): New variables.
(Qlatin, Vscalable_fonts_allowed): Extern it.
(xfont_list_pattern): Argument changed. Callers changed. Check
Vscalable_fonts_allowed. Check the support of a script.
(xfont_list): Don't reject a font spec with :script property.
(xfont_has_char): Fix setting of encoding.
(syms_of_xfont): Staticpro and initialize xfont_scripts_cache and
xfont_scratch_props.
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