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cc: fix %.*s format usage in lexer "token too long" error

--- a/sys/src/cmd/cc/lex.c

+++ b/sys/src/cmd/cc/lex.c

@@ -937,7 +937,7 @@

 	return LDCONST;

 toolong:

-	yyerror("token too long: %.*s...", (int)(cp-symb), symb);

+	yyerror("token too long: %.*s...", utfnlen(symb, cp-symb), symb);

 	errorexit();

 	return -1;

 }