Don't run sapi/fpm tests in parallel with other fpm tests #7696
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See discussion on #7561
fpm tests have been spuriously failing in CI, with 2 parallel workers
on 2 CPUs.
make test TESTS='sapi/fpm/tests -j8'
fails locally for mewithout this change
They're trying to listen on IPv4 on 127.0.0.1 on the same port as other
tests (e.g. helper getPort()=9008 on 64-bit architecture (PHP_INT_SIZE=8)).
So tests will fail (in the old setup) if