patch 7.4.1756
Problem:    "dll" options are not expanded.
Solution:   Expand environment variables. (Ozaki Kiichi)
diff --git a/src/testdir/test_alot.vim b/src/testdir/test_alot.vim
index cb37771..6bfd81e 100644
--- a/src/testdir/test_alot.vim
+++ b/src/testdir/test_alot.vim
@@ -8,6 +8,7 @@
 source test_ex_undo.vim
 source test_expr.vim
 source test_expand.vim
+source test_expand_dllpath.vim
 source test_feedkeys.vim
 source test_fnamemodify.vim
 source test_file_perm.vim