patch 8.1.1797: the vgetorpeek() function is too long

Problem:    The vgetorpeek() function is too long.
Solution:   Split off the part that handles mappings, with fix.
diff --git a/src/version.c b/src/version.c
index 2b91490..c3af73a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -774,6 +774,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1797,
+/**/
     1796,
 /**/
     1795,