This is the second attempt to fix our Git history. This should allow
"git blame" to work correctly in the upb/ directory even though our
automation unexpectedly blew away that directory.
When I tried the previous `arm64` wheel on macOS, I discovered that `pip` on macOS only supports the `arm64` platform tag in a limited set of circumstances. pip seems to prefer `universal2` wheels.
To build a `universal2` wheel, we must run the `llvm-lipo` tool to bundle multiple `cc_binary()` outputs into a single output wheel. We use a transition to depend on multiple architectures for the extension, if we see that we are building for a multiarch CPU.
PiperOrigin-RevId: 447486256
1. For some reason the version script was not working, it was failing to export the main symbol for the Python extension. I fixed this by using the `visibility` attribute instead to export the `PyInit__message` function.
2. We were not properly stripping the `python/dist/` prefix for the C module, which was making the module exported under the name `dist.google._upb` instead of `google._upb`.
3. The `py_library()` rule was failing to actually propagate the module file into the wheel, so I just removed it.
PiperOrigin-RevId: 445446611
Adam Cozzette
Protobuf Team Bot
Mike Kruskal
Joshua Haberman
Protobuf Team