Improve font lookup on MS-Windows
* src/w32font.c (struct font_callback_data): New member 'known_fonts'. (w32font_list_internal, w32font_match_internal): Set up match_data.known_fonts if the font spec includes :script that names one of the non-USB scripts. (add_font_entity_to_list): If font_matches_spec returns zero for a font, and we have some fonts in match_data->known_fonts, consider the font to be a match if it is named in known_fonts. (font_supported_scripts): Update the Unicode Subranges. In particular, map bit 74 to 'burmese', as this is the name Emacs uses, not 'myanmar'. Add a list of scripts that have no USBs defined for them. (syms_of_w32font) <Qburmese, Qcuneiform_numbers_and_punctuation> <Qaegean_number, Qw32_non_USB_fonts>: New symbols. * lisp/term/w32-win.el (w32-no-usb-subranges): New defconst. (w32--filter-USB-scripts, w32-find-non-USB-fonts): New functions. (w32-non-USB-fonts): New defvar. * lisp/international/fontset.el (setup-default-fontset): Add more scripts to automatic setup by representative characters. * doc/emacs/msdos.texi (Windows Fonts): Document 'w32-find-non-USB-fonts' and 'w32-non-USB-fonts'. * etc/NEWS: Mention 'w32-find-non-USB-fonts' and 'w32-non-USB-fonts'.
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