patch 8.2.3937: Insert mode completion function is too long

Problem:    Insert mode completion function is too long.
Solution:   Refactor into multiple functions. (Yegappan Lakshmanan,
            closes #9423)

src/version.c

@@ -749,6 +749,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3937,
 /**/
     3936,
 /**/