Choose better alignment for heavy-duty rendering structures, patch by Matt Turner (#4981)

code/renderer/tr_backend.c

@@ -1142,6 +1142,8 @@ void RB_ExecuteRenderCommands( const void *data ) {
 	}
 
 	while ( 1 ) {
+		data = PADP(data, sizeof(void *));
+
 		switch ( *(const int *)data ) {
 		case RC_SET_COLOR:
 			data = RB_SetColor( data );