gccrs: Properly match delimiters

gccrs: Properly match delimiters

gcc/rust/ChangeLog:

	* expand/rust-macro-expand.cc
	(MacroExpander::try_match_rule): Don't match delimiters for root matcher.
	(MacroExpander::match_matcher): Add option to match delimiters.
	* expand/rust-macro-expand.h
	(MacroExpander::match_matcher): Likewise.
	* parse/rust-parse-impl.h
	(Parser::skip_token): Add zero argument method.
	* parse/rust-parse.h:
	(Parser::skip_token): Likewise.

gcc/testsuite/ChangeLog:

	* rust/compile/macro-delim.rs: New test.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>