Extend rlib xferrecv API
Add xferrecv_last_ref to get hold of the Wimp message id of the request for a scrap file data save, when the RAM transfer gets no reply. This is useful to allow the data save to be distinguished from a file being dragged to an application, without having to resort to string compares against <wimp$scrap>. SWIOptions: Also add RTC to SWI exports, and remove redundant ones. armsys.c: Treat cmd_string as a pointer. xferrecv.c/.h/rl_entries: New function xferrecv_last_ref. Version 5.84. Tagged as 'RISC_OSLib-5_84'
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