patch 8.2.2570: tests fail when run as root

Problem:    Tests fail when run as root.
Solution:   Add a comment mentioning the expected failure. (issue #7919)
diff --git a/src/version.c b/src/version.c
index ffedb4f..add4c38 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2570,
+/**/
     2569,
 /**/
     2568,