Fix for abort loading on OS 3.50/3.60
Robert Sprowson authored
The logic to detect if SWP is available relies on being able to write the procecssor vectors, which isn't possible on OS 3.50/3.60 directly. Since anything that ran those OS versions certainly has SWP, just skip the check.
Tested on OS 3.60, no longer aborts.

Version 0.19. Tagged as 'CallASWI-0_19'
b5e4a24c