Vendor dependencies

Let's see how I like this workflow.

vendor/cxx/tools/buck/prelude/apple/apple_stripping.bzl

@@ -0,0 +1,13 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under both the MIT license found in the
+# LICENSE-MIT file in the root directory of this source tree and the Apache
+# License, Version 2.0 found in the LICENSE-APACHE file in the root directory
+# of this source tree.
+
+load("@prelude//cxx:cxx_context.bzl", "get_cxx_toolchain_info")
+
+def apple_strip_args(ctx: "context") -> "cmd_args":
+    cxx_toolchain_info = get_cxx_toolchain_info(ctx)
+    flags = cxx_toolchain_info.strip_flags_info.strip_non_global_flags
+    return cmd_args(flags) if flags != None else cmd_args(["-x", "-T"])