fix graphic rendering issue with makefiles

Thanks Luggy!

src/r_defs.h

@@ -902,7 +902,7 @@ struct softwarepatch_t
 	INT16 height;
 	INT16 leftoffset;     // pixels to the left of origin
 	INT16 topoffset;      // pixels below the origin
-	INT32 columnofs[8];     // only [width] used
+	INT32 columnofs[];     // only [width] used
 	// the [0] is &columnofs[width]
 } ATTRPACK;