if a port needs 2.x then set MODPY_VERSION=${MODPY_DEFAULT_VERSION_2}.
This commit doesn't change any versions currently used; it may be that
some ports have MODPY_DEFAULT_VERSION_2 but don't require it, those
should be cleaned up in the course of updating ports where possible.
Python module ports providing py3-* packages should still use
FLAVOR=python3 so that we don't have a mixture of dependencies some
using ${MODPY_FLAVOR} and others not.
lang/python port module. I've not yet come up with a port that
would not need this and one can always set MODPY_TESTDEP to "no"
to prevent the module from touching TEST_DEPENDS.
Idea from afresh1 who pointed out the cpan module already does this.
aja "I support this move."
OK sthen@
