Add in ARM architecture support.
    
    This support was taken from the Debian package:
      http://patch-tracking.debian.net/patch/series/view/libaio/0.3.106-3/00_arches.patch
    
    Kedar Sovani tested this on the following processor:
    Processor       : Feroceon 88FR571-vd rev 0 (v5l)
    
    by running the libaio test harness.  All tests passed.  I also ran the
    test harness on a qemu emulated system, and all tests that I could run
    passed.  Due to a bug in qemu, I could not configure a system with enough
    memory to run 2 of the tests.  aio-dio-regress also passed testing on the
    emulated system.