patch 8.0.0247: need to type Ctrl-N twice to select a completion

Problem:    Under some circumstances, one needs to type Ctrl-N or Ctrl-P twice
            to have a menu entry selected. (Lifepillar)
Solution:   call ins_compl_free(). (Christian Brabandt, closes #1411)

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    247,
 /**/
     246,
 /**/