Previously, all the dependencies of the package one wanted to wrap+bind were
re-compiled (including the package to be wrapped). Every single time.
Run `go install -buildmode=c-shared <pkg>` first to cache all of this, and then
run `go build -buildmode=c-shared -o <pkg>.so`.
Fixes#29
Change-Id: I2120d5dd22a4828d952b0681eadde826dff0d586
This CL introduces a split in handling of {py|py2|py3}{thon,}.
It also lifts up the bind.Package creation so the processing is done only once.
Change-Id: I946605fb24885df986baa77088f76df90ff4d168