patch 7.4.1903
Problem:    When writing viminfo merging current history with history in
            viminfo may drop recent history entries.
Solution:   Add new format for viminfo lines, use it for history entries.  Use
            a timestamp for ordering the entries. Add test_settime().
            Add the viminfo version.  Does not do merging on timestamp yet.
diff --git a/src/globals.h b/src/globals.h
index 2e84e57..f5e1bb1 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1639,6 +1639,10 @@
 EXTERN int  did_add_timer INIT(= FALSE);
 #endif
 
+#ifdef FEAT_EVAL
+EXTERN time_t time_for_testing INIT(= 0);
+#endif
+
 /*
  * Optional Farsi support.  Include it here, so EXTERN and INIT are defined.
  */