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

libraries/libstratosphere/include/stratosphere/fs/fs_memory_management.hpp

@@ -42,7 +42,7 @@ namespace ams::fs {
 
         template<typename T>
         std::unique_ptr<T, Deleter> MakeUnique() {
-            static_assert(std::is_pod<T>::value);
+            static_assert(util::is_pod<T>::value);
             return std::unique_ptr<T, Deleter>(static_cast<T *>(::ams::fs::impl::Allocate(sizeof(T))), Deleter(sizeof(T)));
         }