group-base: Add env file that disables building in a tmpfs

Some packages (most notably www-client/firefox) need a considerable
amount of space for temporary build files. Our systems all have
PORTAGE_TMPDIR mounted on a tmpfs. That means that temporary build files
are stored directly in RAM. This is not feasible for packages that need
more than 10 gigabytes of space - even on our most beefy systems.

To disable this on a per-package basis, add an env file that points
PORTAGE_TMPDIR to a directory owned by portage:portage that lies outside
of the tmpfs.

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