05bf12ccb6
Instead of using tempfiles to communicate between child & parent
process. The latter sometimes resulted in hitting the meson timeout if
there was high filesystem pressure.
Fixes: ccaa5b034f "intel/tools: rewrite run-test.sh in python"
Reviewed-by: Dylan Baker <dylan.c.baker@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9528>