MIPS64 using clang head

[Brooks Davis]

On Thu, Dec 03, 2015 at 07:23:33AM -0800, Sean Bruno wrote:
> We're still making progress, with a couple more updates to clang we've
> made it past libc ... now seeing a failure to figure out what
> "LONG_BITS" is.
> 
> https://people.freebsd.org/~sbruno/mips64_buildworld.log
> 
> I'm not quite sure what's missing and I've tried a few hacks to get it
> past here.

This is due to an incompatibility with our limits.h and clang's limits.h
in freestanding mode.  IMO it's a bug that clang's limits.h doesn't
include the system one in freestanding mode, but currently it doesn't
which means LONG_BITS doesn't get set.  Deleting/not installing the
clang limits.h should do the job.

-- Brooks
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