patch 8.0.1497: getting the jump list requires parsing the output of :jumps

Problem:    Getting the jump list requires parsing the output of :jumps.
Solution:   Add getjumplist(). (Yegappan Lakshmanan, closes #2609)
diff --git a/src/Makefile b/src/Makefile
index e0d601c..7cd501e 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2198,6 +2198,7 @@
 	test_job_fails \
 	test_join \
 	test_json \
+	test_jumplist \
 	test_jumps \
 	test_lambda \
 	test_langmap \