patch 7.4.1925

Problem:    Viminfo does not merge file marks properly.
Solution:   Use a timestamp.  Add the :clearjumps command.

src/ex_docmd.c

@@ -474,6 +474,7 @@ static void	ex_folddo(exarg_T *eap);
 #endif
 #ifndef FEAT_JUMPLIST
 # define ex_jumps		ex_ni
+# define ex_clearjumps		ex_ni
 # define ex_changes		ex_ni
 #endif