Static deltas support

https://bugzilla.gnome.org/show_bug.cgi?id=721799

src/libostree/ostree-repo.h

@@ -510,6 +510,7 @@ gboolean ostree_repo_static_delta_generate (OstreeRepo                   *self,
                                             const char                   *from,
                                             const char                   *to,
                                             GVariant                     *metadata,
+                                            GVariant                     *params,
                                             GCancellable                 *cancellable,
                                             GError                      **error);
 
@@ -598,6 +599,14 @@ gboolean ostree_repo_sign_commit (OstreeRepo     *self,
                                   GCancellable   *cancellable,
                                   GError        **error);
 
+gboolean ostree_repo_sign_delta (OstreeRepo     *self,
+                                 const gchar    *from_commit,
+                                 const gchar    *to_commit,
+                                 const gchar    *key_id,
+                                 const gchar    *homedir,
+                                 GCancellable   *cancellable,
+                                 GError        **error);
+
 gboolean ostree_repo_append_gpg_signature (OstreeRepo     *self,
                                            const gchar    *commit_checksum,
                                            GBytes         *signature_bytes,