patch 8.2.0813: libvterm code is slightly different from upstream

Problem:    libvterm code is slightly different from upstream.
Solution:   Use upstream text to avoid future merge problems.  Mainly comment
            style changes.
diff --git a/src/version.c b/src/version.c
index 7d860b2..ce0bc48 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    813,
+/**/
     812,
 /**/
     811,