Don't assume ARM supports unaligned accesses.

Prior to ARMv6, it didn't support it.  ARMv6 supports it, if the "don't
act like ARMv5" bit isn't set in the system control register, but has
another bit in the system control register to cause unaligned accesses
to fault rather than succeed.  ARMv7 and later don't have "act like
ARMv5" mode, but still has the "fault on unaligned access" bit.

At least some OSes might set the "fault on unaligned access" bit; if
your OS *doesn't* set it, feel free to modify the #if to check for your
OS and for ARM.

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