[PATCH] autobuild: Stop waf uninstall from removing test_tmpdir

[Martin Schwenke]

waf uninstall (via BuildContext.install() in Build.py) removes empty
directories all the way up the directory tree.  This means that it
removes test_tmpdir and any empty directories above it.

While this is arguably a waf bug, the simplest solution is to make
test_tmpdir non-empty so it don't get removed.

Please review and maybe push...

peace & happiness,
martin
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