lib/remote: Add a getter for OstreeRemote.name

Now that we’ve got a public, sealed OstreeRemote structure, we can start
carefully exposing members of it as API.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Closes: #875
Approved by: cgwalters

src/libostree/libostree-experimental.sym

@@ -29,3 +29,8 @@ global:
   ostree_remote_ref;
   ostree_remote_unref;
 } LIBOSTREE_2017.6;
+
+LIBOSTREE_2016.7_EXPERIMENTAL {
+global:
+  ostree_remote_get_name;
+} LIBOSTREE_2017.6_EXPERIMENTAL;