Remove libopts toolchain variable

Copybara Import from https://github.com/bazelbuild/rules_cc/pull/495

BEGIN_PUBLIC
Remove libopts toolchain variable (#495)

This appears to have been removed 9 years ago https://github.com/bazelbuild/bazel/commit/a8fc49b3ce772d98e6038a619cccdba81e76ac6d

Closes #495
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COPYBARA_INTEGRATE_REVIEW=https://github.com/bazelbuild/rules_cc/pull/495 from keith:ks/remove-libopts-toolchain-variable 6c4de8d9a81b57851396b9a8e9a4f5b493972c0e
PiperOrigin-RevId: 834423544
Change-Id: I315a178317af6c27c374b5013015c19d4ef92100
diff --git a/cc/private/toolchain/windows_cc_toolchain_config.bzl b/cc/private/toolchain/windows_cc_toolchain_config.bzl
index b9306bf..f6b42d5 100644
--- a/cc/private/toolchain/windows_cc_toolchain_config.bzl
+++ b/cc/private/toolchain/windows_cc_toolchain_config.bzl
@@ -483,16 +483,6 @@
                     ],
                 ),
                 flag_set(
-                    actions = all_link_actions,
-                    flag_groups = [
-                        flag_group(
-                            flags = ["%{libopts}"],
-                            iterate_over = "libopts",
-                            expand_if_available = "libopts",
-                        ),
-                    ],
-                ),
-                flag_set(
                     actions = all_link_actions +
                               [ACTION_NAMES.cpp_link_static_library],
                     flag_groups = [