These packages needed to depend on host-python3 because their Scons
machinery was written in python3, but host-scons itself was depending
on host-python. Now that host-scons depends on host-python3, the
packages that use host-scons no longer have to carry a host-python3
dependency.
The other package using scons, mongodb, does not have a direct
dependency on host-python3, but on a number of host Python 3.x modules
which are needed during the build, so no changes is necessary there.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>