debug tests: Add runningOnWindows() method to BaseTestCase 

Change-Id: Ic7fd197cdaddf8824ac1ef43261c056678433865
Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>
Reviewed-on: https://git.eclipse.org/r/38727
Reviewed-by: Marc Khouzam <marc.khouzam@ericsson.com>
Tested-by: Marc Khouzam <marc.khouzam@ericsson.com>
debug tests: Adapt thread name test for platforms that don't support them

gdb only started reporting thread names at version 7.3. On Windows, they
are never reported.

If somebody wants to enhance the check for MAC OS X, feel free to do it!

Change-Id: I9d028b24930b632678941682da65cd51da9e88dd
Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>
Reviewed-on: https://git.eclipse.org/r/38728
Reviewed-by: Marc Khouzam <marc.khouzam@ericsson.com>
Tested-by: Marc Khouzam <marc.khouzam@ericsson.com>