pull: Add tls-client-cert-{path,key} (if we have new enough libsoup)

This is an actually working version of client-side certificates.
Depends on:
See: https://bugzilla.gnome.org/show_bug.cgi?id=334021

We detect whether libsoup is new enough for this.

https://bugzilla.gnome.org/show_bug.cgi?id=729356

src/libostree/ostree-tls-cert-interaction.h

@@ -0,0 +1,39 @@
+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
+ *
+ * Copyright (C) 2013 Colin Walters <walters@verbum.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+#define OSTREE_TYPE_TLS_CERT_INTERACTION         (ostree_tls_cert_interaction_get_type ())
+#define OSTREE_TLS_CERT_INTERACTION(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), OSTREE_TYPE_TLS_CERT_INTERACTION, OstreeTlsCertInteraction))
+#define OSTREE_TLS_CERT_INTERACTION_CLASS(k)     (G_TYPE_CHECK_CLASS_CAST((k), OSTREE_TYPE_TLS_CERT_INTERACTION, OstreeTlsCertInteractionClass))
+#define OSTREE_IS_TLS_CERT_INTERACTION(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), OSTREE_TYPE_TLS_CERT_INTERACTION))
+#define OSTREE_IS_TLS_CERT_INTERACTION_CLASS(k)  (G_TYPE_CHECK_CLASS_TYPE ((k), OSTREE_TYPE_TLS_CERT_INTERACTION))
+#define OSTREE_TLS_CERT_INTERACTION_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), OSTREE_TYPE_TLS_CERT_INTERACTION, OstreeTlsCertInteractionClass))
+
+typedef struct _OstreeTlsCertInteraction        OstreeTlsCertInteraction;
+typedef struct _OstreeTlsCertInteractionClass   OstreeTlsCertInteractionClass;
+
+GType                       ostree_tls_cert_interaction_get_type    (void) G_GNUC_CONST;
+
+OstreeTlsCertInteraction *  ostree_tls_cert_interaction_new         (GTlsCertificate *cert);
+
+G_END_DECLS