disable imgui win32 functions

FIXME: Compile imgui separately instead

Author: HeliumAnt

Source/GUI/imgui/imgui.cpp

@@ -1097,6 +1097,7 @@ CODE
 #endif
 
 // [Windows] OS specific includes (optional)
+#define IMGUI_DISABLE_WIN32_FUNCTIONS // FIXME: compile separately instead.
 #if defined(_WIN32) && defined(IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS) && defined(IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCTIONS) && defined(IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS) && defined(IMGUI_DISABLE_DEFAULT_SHELL_FUNCTIONS) && !defined(IMGUI_DISABLE_WIN32_FUNCTIONS)
 #define IMGUI_DISABLE_WIN32_FUNCTIONS
 #endif