strip-llvm: Retain the clang-scan-dep tool for c++ modules

Compilers and buildsystems have early support for c++ modules,
see [1], [2].
`clang-scan-dep` is necessary for integration in CMake, potentially
other buildsystems in the future.

Using standard modules like from libc++ is still not solved thoroughly,
and module support from libc++ is marked experimental, documentation
how to use them is WIP [3].

[1]: https://www.kitware.com/import-cmake-the-experiment-is-over
[2]: https://cmake.org/cmake/help/latest/manual/cmake-cxxmodules.7.html
[3]: llvm/llvm-project#80601

strip-llvm.sh

@@ -74,6 +74,8 @@ for i in amdgpu-arch bugpoint c-index-test clang-* clangd clangd-* darwin-debug
         ;;
     clangd)
         ;;
+    clang-scan-deps)
+        ;;
     clang-tidy)
         ;;
     clang-target-wrapper*)