TARGET_ARCH=armv6

[Tim Kientzle]

>>>> <armv6-target-arch.patch>
>>> 
>>> This looks good enough to commit to the projects/armv6 branch.
>> 
>> Done.
>> 
>> Please try TARGET_ARCH=armv6 and let me know
>> what breaks.  I just found that native "make buildworld"
>> miscompiles rtld.  Fortunately, disassembling the good
>> and bad versions only shows a few differences, so I'm
>> tracking those down.

More missing pieces:
  * 'make universe' doesn't yet know about armv6
  * I don't know how 'make universe' can distinguish between 'arm' kernels and 'armv6' kernels. Any ideas?

More generally:
  * What's required before the 'armv6' tree can be merged into -CURRENT?

Tim