Also disable self-contained linker for exec (tool) config.

The process_wrapper is built in exec configuration, which needs
extra_exec_rustc_flag, not just extra_rustc_flag.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sayrer

.bazelrc

@@ -30,6 +30,7 @@ build:ci-linux --host_platform=//tools:linux_remote
 build:ci-linux --jobs=50
 # Rust 1.86+ defaults to rust-lld on linux-x86_64; disable for remote execution
 build:ci-linux --@rules_rust//rust/settings:extra_rustc_flag=-Clink-self-contained=no
+build:ci-linux --@rules_rust//rust/settings:extra_exec_rustc_flag=-Clink-self-contained=no
 build:ci-linux --remote_executor=grpcs://remote.buildbuddy.io
 build:ci-linux --remote_default_exec_properties=container-image=docker://ghcr.io/sayrer/twitter-text-build@sha256:5af27112f67cf17164eb8f762328df9777faf026bf80aa3c8002282eb0aa95a9