McuSupport unit test failing on windows

Unit tests testing third party package creation fail on windows hosts because the tests currently do not properly take into account paths and executables being different on the different host platforms.

The failing tests are test_legacy_createCypressProgrammer3rdPartyPackage() test_legacy_createThirdPartyPackage(). It seems to have been an issue with the tests themselves, not the tested code (testing against linux executables on a windows system)

This has not been caught because apparently everybody developing this plugin is on linux and it seems the ci does not run McuSupport unit tests.