(w32_read_socket): Handle WM_MENUSELECT message.

(w32_read_socket): Handle WM_MENUSELECT message.
(Vw32_charset_to_codepage_alist): Removed.
(Vw32_charset_info_alist): New variable.
(Qw32_charset_[ansi, default, symbol, shiftjis, hangul, gb2312,
chinesebig5, oem, easteurope, turkish, baltic, russian, arabic,
greek, hebrew, thai, johab, mac, unicode]): New symbols.
(x_produce_glyphs): Remove out of date #ifdef 0'd section. Replace
with TODO comment.
(w32_codepage_for_font): Use Vw32_charset_info_alist.
(syms_of_w32term): Remove Vw32_charset_to_codepage_alist.
Define Vw32_charset_info_alist and w32_charset symbols.