patch 9.0.1798: The 'syntax' option has no completion.

Problem:  The 'syntax' option has no completion.
Solution: Add syntax option completion.

closes: #12900

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Doug Kearns <dougkearns@gmail.com>
diff --git a/src/version.c b/src/version.c
index bcba099..fac0300 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1798,
+/**/
     1797,
 /**/
     1796,