Add initial support for '\uNNNN' specifier.
* lex.c (read_ucs): New fn.
(readescape, skip_white_space): Call it.
(is_extended_char, is_extended_char_1): New fns.
(utf8_extend_token): New fn, #if 0'd out.
(real_yylex): Treat extended chars like letters.
From-SVN: r32414
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