Shaped windows don't work on linux

[glreno]

This may only be on virtual desktop setups.

In non-windowed mode, there is no Shaped Window -- there is a grey square around the kitty.
And it doesn't refresh properly either, so all of the other animation frames are visible as the kitty runs.

This is a Linux/Java issue, nothing we can do about this.
There are non-java Linux versions of oneko.