Fix Python sys.path initialization.
Fix Python sys.path initialization.

The Python docs recommend setting updatepath=0, and the code uses the
documented workaround for Python < 2.6.6. However, for the newer
Pythons, the code uses PySys_SetArgv(), which is a shortcut for
updatepath=1, which is opposite to the intended behaviour.

tieto/gplugin-pkg,tieto/gplugin-pkg,tieto/gplugin-pkg,tieto/gplugin-pkg