bind: enable (new-style) buffer interface for python-2
bind: enable (new-style) buffer interface for python-2

Change-Id: I3b4dceb97e743456be57a03d46271eb272634133

go-python/gopy,ericsnowcurrently/gopython-gopy,kellrott/gopy,ericsnowcurrently/gopython-gopy,go-python/gopy-gen,go-python/gopy,go-python/gopy-gen,lifei/gopy,lifei/gopy,kellrott/gopy