Add missing include

include/SDL3/SDL_properties.h

@@ -28,6 +28,8 @@
 #ifndef SDL_properties_h_
 #define SDL_properties_h_
 
+#include <SDL3/SDL_stdinc.h>
+
 #include <SDL3/SDL_begin_code.h>
 /* Set up for C function definitions, even when using C++ */
 #ifdef __cplusplus