Fix rust_doc_test linking with native libraries (#4080)

rust_doc_test does not propagate native libraries into the final test
command. This appears to only affect native libraries built by bazel
rather than ones linked into crates by build.rs. This change only works
with static libraries - dynamic libraries are much more complex.

For example, using the jemalloc bazel module in tikv-jemalloc-sys.

* Add -Clink-arg for all transitive non-crates
* Add include_linker_inputs to collect all linker inputs
* Collect linker roots from all libraries and additional inputs