call to rules that need no lookahead. Check for no lookahead.
* rclex.l (get_string): Correct "strings" list handling.
* resrc.c (read_rc_file): Discard strings.
all returns with MAYBE_RETURN
(MAYBE_RETURN): new, implement the suppression by returning
IGNORED_TOKEN as needed.
(cpp_line): remember which file we're in, mark data from included
*.h files for suppression.
* rcparse.y (input): allow IGNORED_TOKEN outside of known constructs