Add a FLATPAK_DOWNLOAD_TMPDIR variable

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Instead of hardcoding /var/tmp when temporarily downloading layer
tarballs, support overriding with a FLATPAK_DOWNLOAD_TMPDIR
environment variable.

We don't use TMPDIR because the layer tarballs can be very big
(in extreme cases like an SDK > 1GB), and TMPDIR is more
likely to point to a in-memory tmpfs.

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