Allow obsoletion of protected packages

See rpm-software-management/libdnf#1610

libdnf5/rpm/solv/goal_private.cpp

@@ -571,20 +571,16 @@ libdnf5::GoalProblem GoalPrivate::protected_in_removals() {
         return ret;
     }
     auto removes = list_removes();
-    auto obsoleted = list_obsoleted();
-    if (removes.empty() && obsoleted.empty()) {
+    if (removes.empty()) {
         removal_of_protected.reset();
         return ret;
     }
 
     auto & pool = get_rpm_pool();
 
     libdnf5::solv::SolvMap pkg_remove_list(pool->nsolvables);
-    for (auto index = 0; index < removes.size(); ++index) {
-        pkg_remove_list.add_unsafe(removes[index]);
-    }
-    for (auto index = 0; index < obsoleted.size(); ++index) {
-        pkg_remove_list.add_unsafe(obsoleted[index]);
+    for (const auto & remove : removes) {
+        pkg_remove_list.add_unsafe(remove);
     }
 
     libdnf5::solv::SolvMap protected_pkgs(pool->nsolvables);