We need to install clang as a global dependency within the rust base image, so that building/linking native c libraries can be done within builds. One example of this is within the substrate wrapper: https://github.com/polywrap/integrations/tree/main/protocol/substrate/rpc-wrapper

These dependencies used to exist, but were removed here: #1485

This lead to an error when building the the substrate wrapper, which this PR fixes.

I've already republished the polywrap/vm-base-rs:latest tag, but we still need to:

• Build/publish this image for all CPU-arch flavors (amd64, arm, etc). We should setup CD to do this build/publishing automatically.
• Create a patch release of Polywrap 0.9.5, which implements the same CPU-arch + version selection logic for the build images, which has been added to 0.10.0 in the PR above. This will ensure that changes to the latest tag do not modify behavior for 0.9 users.
• Allow developers to customize the base image when building with the "vm" strategy. This will allow them to resolve problems similar to this themselves without requiring a republish to the official polywrap docker hub repository. I've started this work here, but it needs to be finished: feat: Build Manifest 0.3.0 #1370