(Vx_pixel_size_width): New global variable.

(Vx_pixel_size_width): New global variable.
(unibyte_display_via_language_environment): New global variable.
(x_set_font): Add support for setting fontsets.
(Fx_create_frame): Add check_w32(). Initialize fontsets.  Fix
font names to match xlfd-tight-regexp.
(w32_load_font): Rewrite based on x_load_font.
(x_to_w32_charset, w32_to_x_charset): Add character sets.  Use
`iso8859-1' rather than `ansi'.
(w32_to_x_font): Remove `-' from font name.  Remove the `-' off the
end. Move charset into `charset registry' field.
(enum_font_cb2): Check charsets match.  Include width in font list.

(w32_list_fonts): Rewrite based on x_list_fonts.
Moved from w32term.c to have access to enumfont_t struct.
(Fx_list_fonts): w32 specific version eliminated.  Include
`x-list-fonts.c'.
(w32_get_font_info, w32_query_font, w32_find_ccl_program): New
functions for fontset support - adapted from x_ equivalents.
(syms_of_w32fns): New lisp variables initialised.  Function
pointers for fontset.c set up.