fix "implicit instantiation of undefined template"

sh95014 · sh95014 · commit 027b5533a5a7 · 2024-07-07T13:42:30.000-07:00
diff --git a/source/frontends/sdl/imgui/sdlmemory.cpp b/source/frontends/sdl/imgui/sdlmemory.cpp
@@ -7,6 +7,7 @@
 #include "Debugger/DebugDefs.h"
 #include "StrFormat.h"
 
+#include <sstream>
 #include <iomanip>
 
 namespace sa2
