patch 8.2.4560: suspending with CTRL-Z does not work on DragonFlyBSD

Problem:    Suspending with CTRL-Z does not work on DragonFlyBSD.
Solution:   Adjust #ifdef. (Ozaki Kiichi, closes #9943)
diff --git a/src/version.c b/src/version.c
index a8a8a64..a110793 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4560,
+/**/
     4559,
 /**/
     4558,