patch 7.4.2244
Problem:    Adding pattern to ":oldfiles" is not a generic solution.
Solution:   Add the ":filter /pat/ cmd" command modifier.  Only works for some
            commands right now.
diff --git a/src/Makefile b/src/Makefile
index 690e08a..af0ffc0 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2072,6 +2072,7 @@
 	test_farsi \
 	test_feedkeys \
 	test_file_perm \
+	test_filter_cmd \
 	test_filter_map \
 	test_fnamemodify \
 	test_glob2regpat \