Workspace removal broke publishing

[jdm]

There are several issues:

1. the workspace removal and subsequent restructuring broke a number of symlinks that are present in the android-example subdirectory (https://github.com/servo/surfman/tree/main/android-example/app/src/main/assets and https://github.com/servo/surfman/tree/main/android-example/app/src/main/jniLibs/arm64-v8a)
2. cargo publish attempts to verify that all files in android-example are actually present, so we can't publish without fixing the first issue
3. the changes in 1a522fa broke android-example compilation (incidentally, renaming a public module should have been a breaking change and caused 0.10.0)
4. android-example compilation is no longer verified in CI, so we didn't detect issue 3

[jdm]

I worked around this for 0.9.5 by fixing the assets symlinks, unlinking the missing .so, and running with --allow-dirty.

[jschwe]

Just a note - the android example was already broken.
We definitely should add cargo semver checks to CI though.

[jschwe]

This was fixed by #303, right?

[mrobinson]

Yes, I think so!