Improve font selection by family on MS-Windows
* src/w32font.c (w32font_list_internal): Allow 'ascii-0' charset, in addition to 'iso10646-1', 'unicode-bmp', and 'unicode-sip'. This avoids rejecting many font families whose members are shown by 'font-family-list', in particular 'courier' requested by info.el. Without this change, many values of ':family' attribute of a face have no effect on MS-Windows, because they are rejected due to bogus mismatch of the charset.
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