Reviewed missing include

src/core.c

@@ -155,6 +155,7 @@
 #endif
 
 #include <stdlib.h>             // Required for: srand(), rand(), atexit()
+#include <stdio.h>              // Required for: sprintf() [Used in OpenURL()]
 #include <string.h>             // Required for: strrchr(), strcmp(), strlen()
 #include <time.h>               // Required for: time() [Used in InitTimer()]
 #include <math.h>               // Required for: tan() [Used in BeginMode3D()]