Refactor makefile and tests script

We have a working windows makefile, and a test script that only runs on AppVeyor. Test script should be refactored to use a loop instead of duplication, and should be called by [login to view URL] within the 'check' target. Test script should work outside of AppVeyor. [login to view URL] should be refactored to be as DRY and deduplicated as possible using $** and $@. Current files: [login to view URL] [login to view URL]