chroot-tools: Drop support for CHROOTARCH

This only existed to work around a compatibility-breaking change in
the Linux kernel.  `uname -m` for MIPS-64 little-endian changed from
"mips64el" to "mips64".  This meant that all existing packages' CARCH
was no longer == `uname -m`, so we had to de-unify the two, as we
couldn't do `setarch $CARCH`.

I'm removing this kludge because:
 - We no longer actively support MIPS.
 - Until two commits ago, it didn't work anyway
 - We should avoid this on new architectures going forward (ARM,
   anyone?)
 - It's gross.

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