[vala/0.40] vala: Fix circular reference in Property

[Rico Tzschichholz <ricotz src gnome org>]

commit b55d982de50d774ab4797c1ea11b7f972989b160
Author: Princeton Ferro <princetonferro gmail com>
Date:   Sun Mar 1 09:54:13 2020 +0100

    vala: Fix circular reference in Property

 vala/valaproperty.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/vala/valaproperty.vala b/vala/valaproperty.vala
index 4efb9aba0..3227311e8 100644
--- a/vala/valaproperty.vala
+++ b/vala/valaproperty.vala
@@ -191,7 +191,7 @@ public class Vala.Property : Symbol, Lockable {
        private DataType _data_type;
 
        private weak Property _base_property;
-       private Property _base_interface_property;
+       private weak Property _base_interface_property;
        private bool base_properties_valid;
        PropertyAccessor? _get_accessor;
        PropertyAccessor? _set_accessor;