Added 'UnConv' error (see also HdrSrc).
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, 18.104.22.168. Tagged as 'Kernel-5_35-4_79_2_126'
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