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The logic behind this is to permit the calling source file to override which Machine type is used, by GETting a different one first. This can be useful for a component that can only be built for one Machine type (for example, many IOMD-only driver modules). !NoTag

This had been hanging around on the CrossCompilationSupport branch for nearly a year waiting for enough other interesting stuff to warrant an MR, but in doing so it was starting to lag a long way behind master - most recently causing build failures for RISC_OSLib. So to prevent this happening again, I think it's about time to raise it even though it's only a minor change.