mx sram: replace union-with-byte-array with operator[] to make gcc happy.

Source/Core/Core/NetPlayServer.cpp

@@ -353,7 +353,7 @@ unsigned int NetPlayServer::OnConnect(ENetPeer* socket)
   spac << static_cast<MessageId>(NP_MSG_SYNC_GC_SRAM);
   for (size_t i = 0; i < sizeof(g_SRAM) - offsetof(Sram, settings); ++i)
   {
-    spac << g_SRAM.raw[offsetof(Sram, settings) + i];
+    spac << g_SRAM[offsetof(Sram, settings) + i];
   }
   Send(player.socket, spac);