patch 8.2.4825: can only get a list of mappings

Problem:    Can only get a list of mappings.
Solution:   Add the optional {abbr} argument. (Ernie Rael, closes #10277)
            Rename to maplist().  Rename test file.
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index e1a786f..4a2ea88 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -184,7 +184,7 @@
 	test_lua \
 	test_makeencoding \
 	test_man \
-	test_maparg \
+	test_map_functions \
 	test_mapping \
 	test_marks \
 	test_match \
@@ -425,7 +425,7 @@
 	test_lua.res \
 	test_makeencoding.res \
 	test_man.res \
-	test_maparg.res \
+	test_map_functions.res \
 	test_mapping.res \
 	test_marks.res \
 	test_match.res \