Also skip the shutdown integration test in headless mode
Also skip the shutdown integration test in headless mode

Likewise, as with the JUnit tests, we cannot really test this properly
in headless mode, and rely on the (non-headless) Windows node of Jenkins
to run this test regularly.

Again, thanks Josias Jenkins! What would we do without you...

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

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