Make sure /var/tmp is not on tmpfs
Make sure /var/tmp is not on tmpfs

Apps may rely on /var/tmp not being in ram, for instance when
downloading large files. See for instance:

  http://0pointer.net/blog/projects/tmp.html

We make /var/tmp point to ~/.var/app/cache/tmp so that each app get
its own instane, and so that its cleared whe removing xdg-cache-dir
for the app.

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