Mark two tests that depend on p4est as such.

diff --git a/tests/bits/point_value_03.mpirun=1.output b/tests/bits/point_value_03.with_p4est=on.mpirun=1.output
similarity index 100%
rename from tests/bits/point_value_03.mpirun=1.output
rename to tests/bits/point_value_03.with_p4est=on.mpirun=1.output

diff --git a/tests/bits/point_value_03.mpirun=7.output b/tests/bits/point_value_03.with_p4est=on.mpirun=7.output
similarity index 100%
rename from tests/bits/point_value_03.mpirun=7.output
rename to tests/bits/point_value_03.with_p4est=on.mpirun=7.output