Instead of including the Py2 python.inc and having to undo some of the
assignments, create a new python3.inc to hold the common configuration.
Over time we can move more from the recipes into this file to unify the target
and native recipes.
(From OE-Core rev: fc4767113adbdfbf4aeaaf6dd8605e7fd4bbaa46)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>