Make sure the work space is clean before starting a test, this is mainly for developer builds, as CI
runs will generally wipe the entire build tree instead.
These files are the current 4 source code files used to create the
regression test suite
loader_regression_tests.cpp and loader_version_tests.cpp contain a
majority of the tests.
loader_wsi_test.cpp is all the tests pertaining to the WSI functions
in the loader.
loader_testing_main.cpp contains the `main()` which has windows CRT
specific calls to disable popups and debug aserts.
There are two executables created, test_regression and test_wsi.
test_regression is both regression_tests and version_tests. test_wsi
is the WSI tests. These tests are separate as they rely on linking
with platform specific windowing libraries which may not be present
on a CI system.
Change-Id: I1c02b0f82826d337599f4a9a7c02dde40ea5afa3