process_wrapper does not substitute in param files

[roman-kashitsyn]

Sometimes rules_rust issues rustc commands with command line flags stored in.params files:

[
  "bazel-out/k8-opt-exec-2B5CBBC6/bin/external/rules_rust/util/process_wrapper/process_wrapper",
  "--arg-file",
  "bazel-out/k8-opt/bin/external/crate_index__serde-1.0.144/serde_build_script.linksearchpaths",
  "--subst",
  "pwd=${pwd}",
  "--",
  "bazel-out/k8-opt/bin/external/rust_linux_x86_64__x86_64-unknown-linux-gnu_tools/rust_toolchain/bin/rustc",
  "@bazel-out/k8-opt/bin/rs/scenario_tests/e2e-test-driver-0.params"
]

However, there is no logic in process_wrapper to substitute ${pwd} in @*.params arguments. This can result in non-deterministic build artifacts.