Switch atmosphere's build target to C++20. (#952)

* ams: update to build with gcc10/c++20

* remove mno-outline-atomics

* ams: take care of most TODO C++20s

* fusee/sept: update for gcc10

* whoosh, your code now uses pre-compiled headers

* make: dependency fixes

stratosphere/dmnt/source/dmnt_service.hpp

@@ -55,7 +55,7 @@ namespace ams::dmnt {
         }
     };
 
-    static_assert(std::is_pod<TargetIOFileHandle>::value && sizeof(TargetIOFileHandle) == sizeof(u64), "TargetIOFileHandle");
+    static_assert(util::is_pod<TargetIOFileHandle>::value && sizeof(TargetIOFileHandle) == sizeof(u64), "TargetIOFileHandle");
 
     class DebugMonitorService final : public sf::IServiceObject {
         private: