patch 8.2.1678: crash when using ":set" after ":ownsyntax"

Problem:    Crash when using ":set" after ":ownsyntax".
Solution:   Make sure 'spelloptions' is not NULL. (closes #6950)
diff --git a/src/version.c b/src/version.c
index 0d0ea4d..a59b82d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1678,
+/**/
     1677,
 /**/
     1676,