With inspiration from @KevinBrolly, this patch uses the stack image
SQLite3 package but also still providing the dev headers and binary that
users may still be using today. The benefit is that we won't need to
rebuild all the python binaries for this to take affect. We can just
stop shipping SQLite3 from future binaries. In addition, we don't need
to worry about what version and when to update SQLite3 and maintaining
the packages ourselves.
This also includes updates to Python 2.7.15 and Python 3.6.6 so they can
rebuilt with the stack image dev headers instead of building our own
vendored SQLite3.
Casey Faist