patch 8.2.4275: cannot use an autoload function from a package under start

Problem:    Cannot use an autoload function from a package under start.
Solution:   Also look in the "start" package directory. (Bjorn Linse,
            closes #7193)
diff --git a/src/scriptfile.c b/src/scriptfile.c
index dec512a..cee3f54 100644
--- a/src/scriptfile.c
+++ b/src/scriptfile.c
@@ -2294,7 +2294,7 @@
 
 	// Try loading the package from $VIMRUNTIME/autoload/<name>.vim
 	// Use "ret_sid" to avoid loading the same script again.
-	if (source_in_path(p_rtp, scriptname, 0, &ret_sid) == OK)
+	if (source_in_path(p_rtp, scriptname, DIP_START, &ret_sid) == OK)
 	    ret = TRUE;
     }