fix cache_links for target platform

Summary:
Motivation: In order to disable remote linking in RL zhongjianluxian have done some work D60529117 disabling `cache_links`. Unfortunately those changes did't take any affect  because of the bug fixed in this diff.

The code fixed in this diff was initially introduced to to enable `cache_links` for execution platform only. (cc scottcao who has more context). Unfortunately it affects target platform as well. So this diff if fixing it.

Reviewed By: scottcao

Differential Revision: D61659969

fbshipit-source-id: 8d60f251125e4fc4dfc5d703d6ade275622bb054

native.bzl

@@ -387,9 +387,7 @@ def _cxx_toolchain_macro_stub(**kwargs):
         cache_links = kwargs.get("cache_links")
         kwargs["cache_links"] = select({
             "DEFAULT": cache_links,
-            "ovr_config//build_mode:fbcode-build-info-mode-disable": True,
-            "ovr_config//build_mode:fbcode-build-info-mode-full": False,
-            "ovr_config//build_mode:fbcode-build-info-mode-stable": True,
+            "ovr_config//platform/execution/constraints:execution-platform-transitioned": True,
         })
     cxx_toolchain_macro_impl(
         cxx_toolchain_rule = cxx_toolchain_inheriting_target_platform,