test: ignore the real XDG_CONFIG_HOME during tests #173
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Let's not have our tests fail if the user has an incompatible
$XDG_CONFIG_HOME/xkb
directory.libxkbcommon has fallbacks when XDG_CONFIG_HOME isn't set so we need to override this with a real directory instead of just unsetting it.
But how can this happen? Well, for example if you're trying to run the test suite on git master when you already have a xkb directory for #162 :)