[antlir/metalos][oss] fix some third party deps builds (#249)

Summary:

Title

Test Plan:
```
❯ buck build //third-party/rust:ring-0.17.8
Build ID: e40e98af-65fc-4844-bc1a-333876188cae
Network: Up: 0B  Down: 4.0MiB
Jobs completed: 17. Time elapsed: 1.1s.
Cache hits: 0%. Commands: 3 (cached: 0, remote: 0, local: 3)
BUILD SUCCEEDED
metalos//third-party/rust:ring-0.17.8 buck-out/v2/gen/metalos/904931f735703749/third-party/rust/__ring-0.17.8__/out/rlib-pic-static_pic-metadata-fast-diag/libring-228647f1.rmeta

❯ buck build //third-party/rust:reqwest
Build ID: 9c1bf166-3835-485a-96fd-05b44bcd3abf
Network: Up: 0B  Down: 0B
Jobs completed: 13. Time elapsed: 0.9s.
Cache hits: 0%. Commands: 4 (cached: 0, remote: 0, local: 4)
BUILD SUCCEEDED
antlir//third-party/rust:reqwest buck-out/v2/gen/antlir/904931f735703749/third-party/rust/__reqwest-0.11.27__/out/rlib-pic-static_pic-metadata-fast-diag/libreqwest-79d51cdc.rmeta
```

Differential Revision: D59928725