patch 8.2.2778: problem restoring 'packpath' in session

Problem:    Problem restoring 'packpath' in session.
Solution:   Let "skiprtp" also apply to 'packpath'.
diff --git a/src/version.c b/src/version.c
index 17afa34..83d7e57 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2778,
+/**/
     2777,
 /**/
     2776,