patch 8.2.1920: listlbr test fails when run after another test

Problem:    Listlbr test fails when run after another test.
Solution:   Add test separately to list of test targets.
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index 8568824..364221f 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -416,6 +416,7 @@
 	test_listdict.res \
 	test_listener.res \
 	test_listlbr.res \
+	test_listlbr_utf8.res \
 	test_lua.res \
 	test_makeencoding.res \
 	test_man.res \