patch 9.1.0882: too many strlen() calls in insexpand.c

Problem:  too many strlen() calls in insexpand.c
Solution: Refactor insexpand.c and reduce number of calls to STRLEN(),
          fix a warning get_next_filename_completion(), add new function
          ins_compl_leader_len() (John Marriott)

closes: #16095

Signed-off-by: John Marriott <basilisk@internode.on.net>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 4eea94a..9adbf9b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    882,
+/**/
     881,
 /**/
     880,