patch 8.1.1044: no way to check the reference count of objects

Problem:    No way to check the reference count of objects.
Solution:   Add test_refcount(). (Ozaki Kiichi, closes #4124)
diff --git a/src/version.c b/src/version.c
index f6b3724..d0f63ef 100644
--- a/src/version.c
+++ b/src/version.c
@@ -776,6 +776,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1044,
+/**/
     1043,
 /**/
     1042,