Remove C++ linking from oso_prefix feature for now

Currently in the macOS toolchain C++ linking goes through
`cc_wrapper.sh`, not `wrapped_clang`. I didn't add the handling to
`cc_wrapper` for this argument. These wrappers will likely go away soon,
when they do we should probably make them route to wrapped_clang
instead, in which case we could revert this.

#12304

Closes #12356.

PiperOrigin-RevId: 340817292

tools/osx/crosstool/cc_toolchain_config.bzl

@@ -5722,8 +5722,7 @@ def _impl(ctx):
         name = "oso_prefix_is_pwd",
         flag_sets = [
             flag_set(
-                actions = all_link_actions +
-                          ["objc-executable", "objc++-executable"],
+                actions = ["objc-executable", "objc++-executable"],
                 flag_groups = [flag_group(flags = ["OSO_PREFIX_MAP_PWD"])],
             ),
         ],