python3-native: use the previous version of python-config script

python3-native: use the previous version of python-config script

In python 3.4 python-config was rewritten in shell, ironically
to support cross-compilation:
https://bugs.python.org/issue16235

This new shell version is broken in several ways, and doesn't
have our oe-specific tweaks. Let's revert to the old script,
which is still provided.

Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>