patch 8.1.0439: recursive use of getcmdline() still not protected

Problem:    Recursive use of getcmdline() still not protected.
Solution:   Instead of saving the command buffer when making a call which may
            cause recursiveness, save the buffer when actually being called
            recursively.
diff --git a/src/version.c b/src/version.c
index f4e0508..1f14030 100644
--- a/src/version.c
+++ b/src/version.c
@@ -795,6 +795,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    439,
+/**/
     438,
 /**/
     437,