patch 8.0.1514: getting the list of changes is not easy

Problem:    Getting the list of changes is not easy.
Solution:   Add the getchangelist() function. (Yegappan Lakshmanan,
            closes #2634)
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index 2d98fa6..e3230c5 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -75,6 +75,7 @@
 	    test_breakindent.res \
 	    test_bufwintabinfo.res \
 	    test_cdo.res \
+	    test_changelist.res \
 	    test_channel.res \
 	    test_charsearch.res \
 	    test_cindent.res \