Test with the the "cc" feature enabled, in CI.

Enabling the "cc" feature causes the build.rs script to check that the
precompiled libraries match the libraries generated from source.

This also updates the libraries, in which the only change is the debug
info string mentioning the compilation directory chaging from "rsix"
to "rustix".

.github/workflows/main.yml

@@ -302,7 +302,7 @@ jobs:
       if: matrix.qemu != '' && matrix.os == 'ubuntu-latest'
 
     - run: |
-        cargo test --verbose --features=all-impls,procfs --release --workspace -- --nocapture
+        cargo test --verbose --features=all-impls,procfs,cc --release --workspace -- --nocapture
       env:
         RUST_BACKTRACE: 1