[m68k] arch flag cleanup v2

[Nathan Sidwell]

Ben Elliston wrote:

Thanks for the review.  I've made the changes you suggested.

> OK with the changes above.  I wouldn't mind some test cases, either!
> (In particlar for the merging logic).

This is what I've committed, after testing.  I added a set of linker merge 
tests. I also discovered I needed a m68k version of bfd_default_compatible to 
deal with the coldfire/m68k differences.


nathan

-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

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