patch 9.0.1298: inserting register on the cmdline does not trigger incsearch

Problem:    Inserting a register on the command line does not trigger
            incsearch or update hlsearch.
Solution:   Have cmdline_insert_reg() return CMDLINE_CHANGED when appropriate
            and handle it correctly. (Ken Takata, closes #11960)

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1298,
 /**/
     1297,
 /**/