patch 8.2.0871: cannot use getmarklist() as a method

Problem:    Cannot use getmarklist() as a method.
Solution:   Make getmarklist() work as a method.  Add one to the column
            number to match getpos(). (Yegappan Lakshmanan, closes #6176)
diff --git a/src/version.c b/src/version.c
index e51e650..7138ac5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    871,
+/**/
     870,
 /**/
     869,