Update raylib.h

src/raylib.h

@@ -965,7 +965,7 @@ typedef enum {
 // WARNING: These callbacks are intended for advanced users
 typedef void (*TraceLogCallback)(int logLevel, const char *text, va_list args); // Logging: Redirect trace log messages
 typedef unsigned char *(*LoadFileDataCallback)(const char *fileName, int *dataSize); // FileIO: Load binary data
-typedef bool (*SaveFileDataCallback)(const char *fileName, void *data, int dataSize);   // FileIO: Save binary data
+typedef bool (*SaveFileDataCallback)(const char *fileName, const void *data, int dataSize); // FileIO: Save binary data
 typedef char *(*LoadFileTextCallback)(const char *fileName);                  // FileIO: Load text data
 typedef bool (*SaveFileTextCallback)(const char *fileName, const char *text); // FileIO: Save text data