patch 8.1.0640: get E14 while typing command :tab with 'incsearch' set

Problem:    Get E14 while typing command :tab with 'incsearch' set.
Solution:   Do not give an error when looking for the command. (Yasuhiro
            Higashi)
diff --git a/src/version.c b/src/version.c
index 30f2899..10ba489 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    640,
+/**/
     639,
 /**/
     638,