patch 8.1.0814: :mksession cannot handle a very long 'runtimepath'

Problem:    :mksession cannot handle a very long 'runtimepath'. (Timothy
            Madden)
Solution:   Expand each part separately, instead of the whole option at once.
            (Christian Brabandt, closes #3466)
diff --git a/src/version.c b/src/version.c
index 230d2fb..9805015 100644
--- a/src/version.c
+++ b/src/version.c
@@ -788,6 +788,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    84,
+/**/
     813,
 /**/
     812,