Avoid double-linking libc++ in Bazel v8 builds

MODULE.bazel

@@ -7,6 +7,7 @@ single_version_override(
     patch_strip = 1,
     patches = [
         "//patches:toolchains_llvm_bootstrapped_resource_dir.patch",
+        "//patches:toolchains_llvm_bootstrapped_linux_skip_static_runtime_libs.patch",
     ],
 )
 

patches/toolchains_llvm_bootstrapped_linux_skip_static_runtime_libs.patch

@@ -0,0 +1,21 @@
+diff --git a/runtimes/BUILD.bazel b/runtimes/BUILD.bazel
+index 9db8749..a968bcc 100644
+--- a/runtimes/BUILD.bazel
++++ b/runtimes/BUILD.bazel
+@@ -35,11 +35,11 @@ filegroup(
+ filegroup(
+     name = "static_runtime_lib",
+     srcs = select({
+-        "@platforms//os:linux": [
+-            "@libcxx//:libcxx.static",
+-            "@libcxxabi//:libcxxabi.static",
+-            "@libunwind//:libunwind.static",
+-        ],
++        # The prebuilt rusty_v8 Linux archive already vendors the C++ runtime
++        # objects it needs. Re-linking llvm's static libc++ family in Bazel
++        # causes duplicate stdexcept symbols in Rust binaries that depend on v8.
++        # Keep the Linux runtime libgroup empty and rely on the archive instead.
++        "@platforms//os:linux": [],
+         "@platforms//os:windows": [
+             "@libcxx//:libcxx.static",
+             "@libcxxabi//:libcxxabi.static",