patch 8.0.0634: cannot easily get to the last quickfix list

Problem:    Cannot easily get to the last quickfix list.
Solution:   Add "$" as a value for the "nr" argument of getqflist() and
            setqflist(). (Yegappan Lakshmanan)
diff --git a/src/version.c b/src/version.c
index eb25404..d5e5078 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    634,
+/**/
     633,
 /**/
     632,