Add patch: Do not forward declare UIResourceRequest, Identity, IdentityKey.

This seems to be necessary to compile for OSX 10.7,
and this is the OSX version we currently use in the CI system.

Change-Id: I1edcf35baee040328de11801f58ce78ed1f8f6cb
Reviewed-by: Andras Becsi <andras.becsi@digia.com>