Merge branch 'rs/opt-parse-long-fixups'

The parse-options code that deals with abbreviated long option names have been cleaned up. Reviewed-by: Josh Steadmon <steadmon@google.com> cf. <ZfDM5Or3EKw7Q9SA@google.com> * rs/opt-parse-long-fixups: parse-options: rearrange long_name matching code parse-options: normalize arg and long_name before comparison parse-options: detect ambiguous self-negation parse-options: factor out register_abbrev() and struct parsed_option parse-options: set arg of abbreviated option lazily parse-options: recognize abbreviated negated option with arg