Fix rust settings when building with clang.

The recent update to rules_rust 0.54.1 changed the location
of these config settings, but these flags were missed
because presubmit checks don't use clang.

I verified that these flags are still necessary.

Change-Id: Ibe960934696b5ed2bc2f58b61aba5f8acb612c3c

.bazelrc

@@ -53,11 +53,11 @@ build:ubsan --linkopt=-fsanitize-link-c++-runtime
 build:ubsan --action_env UBSAN_OPTIONS=halt_on_error=1:print_stacktrace=1
 test:ubsan --test_tag_filters=-noubsan
 
-# rules_rust 0.48 doesn't work with rust's experimental lld linking and clang
+# rules_rust 0.54.1 doesn't work with rust's experimental lld linking and clang
 # (https://blog.rust-lang.org/2024/05/17/enabling-rust-lld-on-linux.html).
-build:asan --@rules_rust//:extra_rustc_flag=-Zlinker-features=-lld --@rules_rust//:extra_exec_rustc_flag=-Zlinker-features=-lld
-build:tsan --@rules_rust//:extra_rustc_flag=-Zlinker-features=-lld --@rules_rust//:extra_exec_rustc_flag=-Zlinker-features=-lld
-build:ubsan --@rules_rust//:extra_rustc_flag=-Zlinker-features=-lld --@rules_rust//:extra_exec_rustc_flag=-Zlinker-features=-lld
+build:asan --@rules_rust//rust/settings:extra_rustc_flag=-Zlinker-features=-lld --@rules_rust//rust/settings:extra_exec_rustc_flag=-Zlinker-features=-lld
+build:tsan --@rules_rust//rust/settings:extra_rustc_flag=-Zlinker-features=-lld --@rules_rust//rust/settings:extra_exec_rustc_flag=-Zlinker-features=-lld
+build:ubsan --@rules_rust//rust/settings:extra_rustc_flag=-Zlinker-features=-lld --@rules_rust//rust/settings:extra_exec_rustc_flag=-Zlinker-features=-lld
 
 # Settings for remote build execution.
 build:cfc-remote --experimental_allow_tags_propagation