Some m68k compatibility fixes

[Ben Elliston]

Hi Richard

> bfd/
> 	* cpu-m68k.c (bfd_m68k_compatible): Treat ISA A+ and ISA B code as
> 	incompatible.  Likewise MAC and EMAC code.
> 	* elf32-m68k.c (elf32_m68k_merge_private_bfd_data): Use
> 	bfd_get_compatible to set the new bfd architecture.  Rely on it
> 	to detect incompatibilities.
> 
> gas/
> 	* config/tc-m68k.c (m68k_cpus): Change cpu_cf5208 entries to use
> 	mcfemac instead of mcfmac.
> 
> ld/testsuite/
> 	* ld-m68k/merge-error-1a.s, ld-m68k/merge-error-1b.s,
> 	* ld-m68k/merge-error-1a.d, ld-m68k/merge-error-1b.d,
> 	* ld-m68k/merge-error-1c.d, ld-m68k/merge-error-1d.d,
> 	* ld-m68k/merge-error-1e.d, ld-m68k/merge-ok-1a.d,
> 	* ld-m68k/merge-ok-1b.d: New tests.
> 	* ld-m68k/m68k.exp: Run them.

OK to apply; thanks for the detailed description of the changes.  Now
onto Nathan's patch, who has been even more patient.  :-)

Cheers, Ben
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