patch 8.2.3926: build failure without the 'autochdir' option

Problem:    Build failure without the 'autochdir' option. (John Marriott)
Solution:   Add #ifdefs.
diff --git a/src/version.c b/src/version.c
index 60b1e5c..e091971 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3926,
+/**/
     3925,
 /**/
     3924,