Update error block validity checks to cope with Wimp "program errors"
Detail: s/Kernel - With RISC OS 3.5, one of the ways Wimp_ReportError detects program errors is by bits 24-29 of the error number being set to 011011. Update our error block validity checks to allow that pattern through. Admin: Tested on Raspberry Pi Fixes issue reported on forums: https://www.riscosopen.org/forum/forums/3/topics/3540?page=2#posts-60089 Version 5.65. Tagged as 'Kernel-5_65'
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