test: use the glib function for a tmpdir in $TMP

mkdtmp() creates the directory in $PWD, let's use the glib function to create
it in $TMP instead. With mkdtmp() running ninja test can sometimes fail due to
a race contion: our pytest invocation collects all files in the current
directory, the dbverify test creates files that may be removed before pytest
gets to actually open them.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

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