patch 8.2.4750: small pieces of dead code

Problem:    Small pieces of dead code.
Solution:   Remove the dead code. (Goc Dundar, closes #10190) Rename the
            qftf_cb struct member to avoid confusion.
diff --git a/src/version.c b/src/version.c
index 40ed189..68b61f4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4750,
+/**/
     4749,
 /**/
     4748,