Windows toolchain fix [IO-410] (#159)

Similar to #157, some
more files need to be cleaned up (`dwp_files`). While this might work
with WORKSPACE, the build fails when using `bzl_mod`.

This changes is tested in:
- [x] starling-core as `WORKSPACE`
- [x] starling-core as `bzl_mod`

Author: martin4861

cc/toolchains/llvm_x86_64_windows/BUILD.bazel

@@ -51,14 +51,6 @@ filegroup(
     ],
 )
 
-filegroup(
-    name = "dwp_files",
-    srcs = [
-        ":wrappers",
-        "@llvm_mingw_toolchain//:dwp",
-    ],
-)
-
 filegroup(
     name = "linker_files",
     srcs = [