Make the lexer pass whitespace through (as OTHER tokens) for text lines.

With this change, we can recreate the original text-line input
exactly. Previously we were inserting a space between every pair of
tokens so our output had a lot more whitespace than our input.

With this change, we can drop the "-b" option to diff and match the
input exactly.

glcpp-parse.y

@@ -517,8 +517,6 @@ _token_list_print (token_list_t *list)
 
 	for (node = list->head; node; node = node->next) {
 		_token_print (node->token);
-		if (node->next)
-			printf (" ");
 	}
 }