Build fixes for variants pre RISC OS 5
Minor fixups as part of univeral !Boot work. Options no longer ASSERT on International_Help (which is a definition exported by the kernel, rather than a build switch), and instead define a switch which is true for > 3.50. Non UTF8 supporting case has simple substitutes for Wimp_TextOp. Legacy_DomainId and LegacyIRQsema no longer cause NULL pointer dereference. MOVeQ => MOVEQ to placate ObjAsm. Ursula_RPC version built and used briefly on RISC OS 4.02 host. No other run time testing. Version 5.22. Tagged as 'Wimp-5_22'
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