[CFT/RFC] Make crunched compatible with external linkers

[Erik Cederstrand]

Hello hackers,

The following PR patches crunchide(1) to accept object files produced by the gold and mclinker linkers: http://www.freebsd.org/cgi/query-pr.cgi?pr=bin%2F174011

On behalf of the submitter, I'd like to request a review of the patch, and testing of crunchide/crunchgen especially on SPARC and ARM.

Thanks,
Erik