Include the standard headers that newer code uses directly

These files use std::function, std::map, std::deque, std::unique_ptr or std::string_view and got
the header through others, which MSVC's standard library doesn't always do.

Common/Net/HTTPServer.cpp

@@ -1,6 +1,8 @@
 #include "Common/TimeUtil.h"
 #include "ppsspp_config.h"
 
+#include <memory>
+
 #ifdef _WIN32
 
 #ifndef NOMINMAX