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/ncm/ncm_content_info.hpp

@@ -55,7 +55,7 @@ namespace ams::ncm {
         }
     };
 
-    static_assert(sizeof(std::is_pod<ContentInfo>::value));
+    static_assert(sizeof(util::is_pod<ContentInfo>::value));
     static_assert(sizeof(ContentInfo)  == 0x18);
 
 }