Add a way to check INTERFACE user property compatibility.
Add a test for the interfaces in targets exported from the build tree.
Merge topic 'test-export-iface-genex' into next

0de21a3 Add a test for the interfaces in targets exported from the build tree.
Merge topic 'compatible-INTERFACE-user-properties' into next

e5314d1 Add a way to check INTERFACE user property compatibility.