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Implement OS_ConvertVariform, internally the other conversions now just call it.
Add tester for Variform to 'Dev'.
Made block copy weirdness for XScale dependent on XScale arch flag.

Version 5.35, 4.79.2.126. Tagged as 'Kernel-5_35-4_79_2_126'

Detail:
  * Merged in the change to RISC OS 4.02 kernel that moved the GSTrans
    workspace out of scratch space.
  * Fixed a few bugs in callback postponement, and interrupt holes in
    callback dispatch. See Docs.CallbackChange for full info.
  * Fixed SystemSizeCMOS to SysHeapCMOS - wouldn't build as was.
  * Added an export of a C version of Hdr:HALDevice, based on the Hdr2H
    translation but with an additional struct definition. Required by
    SoundControl 1.00.
  * Added some additional location and ID allocations to Hdr:HALDevice.
    Required by today's HAL and SoundControl.
Admin:
  Partially tested.

Version 5.35, 4.79.2.56. Tagged as 'Kernel-5_35-4_79_2_56'

Clean reimport of hdr.RISCOS (real commit date 2008-03-28 by bavison), without any of the 3rd party allocations.