E3-1186: Allow tests to be run with debug architecture if specified

This MR does two things:

• If EPICS_HOST_ARCH is set to the debug architecture when running make test then it will run the tests using that same architecture. This allows, for example, for better debugging if a segmentation fault and core dump happens during a test.
• In order to test for the debug arch to be available, we look for the existence of softIocPVA. Given this, I realise that this is a bit weird that we still allow for softIoc to be used as a vestigal bit of support for base 3.xx, and as such I have elected to remove it. If prefered, that commit can be removed and moved to a separate MR.

requested review from @anderslindh1, @douglasaraujo, and @lucasmagalhaes

assigned to @simonrose

added 1 commit

• 2c2626c8 - Remove support for softIoc from iocsh

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approved this merge request

mentioned in commit b60a9122

merged