patch 8.0.0844: wrong function prototype because of missing static

Problem:    Wrong function prototype because of missing static.
Solution:   Add "static".
diff --git a/src/version.c b/src/version.c
index 2db4ca9..ee0a081 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    844,
+/**/
     843,
 /**/
     842,