patch 8.2.3863: various build flags accidentally enabled

Problem:    Various build flags accidentally enabled.
Solution:   Revert several lines in Makefile.
diff --git a/src/version.c b/src/version.c
index bca9382..586d2ec 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3863,
+/**/
     3862,
 /**/
     3861,