GHS: Update test suite

-- Allow for testing default toolset settings
   If CMake_TEST_GreenHillsMULTI_config is not defined then
   just run the GHS tests using defaults.
-- Handle paths that contain spaces
-- Update test suite to use "-non_shared" linker option
   Fixes linking issue if GHS is not shipped with shared libraries
-- Other minor cleanup
14 jobs for GHS_updates
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