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/libvapours/include/vapours/crypto/impl/crypto_sha256_impl.hpp

@@ -66,6 +66,6 @@ namespace ams::crypto::impl {
             }
     };
 
-    /* static_assert(HashFunction<Sha256Impl>); */
+    static_assert(HashFunction<Sha256Impl>);
 
 }