patch 8.0.1377: cannot call a dict function in autoloaded dict

Problem:    Cannot call a dict function in autoloaded dict.
Solution:   Call get_lval() passing the read-only flag.
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index df79e9a..5d5fccf 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -73,6 +73,7 @@
 	    test_assert.res \
 	    test_autochdir.res \
 	    test_autocmd.res \
+	    test_autoload.res \
 	    test_backspace_opt.res \
 	    test_breakindent.res \
 	    test_bufwintabinfo.res \