patch 8.2.4023: using uninitialized variable

Problem:    Using uninitialized variable.
Solution:   Initialize "ufunc" also when an item is not exported.
diff --git a/src/version.c b/src/version.c
index 68c194b..cb331fa 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4023,
+/**/
     4022,
 /**/
     4021,