cppexp.c (struct op, [...]): Replace U_CHAR with uchar.

cppexp.c (struct op, [...]): Replace U_CHAR with uchar.

	* cppexp.c (struct op, parse_number): Replace U_CHAR with uchar.
	* cppfiles.c (read_include_file): Similarly.
	* cpphash.h (DSC, U_CHAR, ustrcmp, ustrncmp, ustrlen,
	uxstrdup ustrchr, ufputs): Similarly.
	* cppinit.c (TRIGRAPH_MAP, cpp_destroy): Similarly.
	* cpplex.c (parse_slow, unescaped_terminator_p, save_comment,
	cpp_ideq, parse_identifier, parse_number): Similarly.
	* cpplib.c (struct directive, dequote_string, D, run_directive,
	cpp_push_buffer): Similarly.
	* cppmacro.c (new_string_token, builtin_macro, cpp_quote_string,
	_cpp_create_definition, check_trad_stringification,
	cpp_macro_definition): Similarly.

From-SVN: r52587