sysprofd: implement org.gnome.Sysprof2 compatability API

This allows the new sysprofd to service requests for older clients
expecting to talk to or.gnome.Sysprof2.

src/sysprofd/ipc-legacy-impl.h

@@ -0,0 +1,33 @@
+/* ipc-legacy-impl.h
+ *
+ * Copyright 2019 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include "ipc-legacy.h"
+
+G_BEGIN_DECLS
+
+#define IPC_TYPE_LEGACY_IMPL (ipc_legacy_impl_get_type())
+
+G_DECLARE_FINAL_TYPE (IpcLegacyImpl, ipc_legacy_impl, IPC, LEGACY_IMPL, IpcLegacySysprof2Skeleton)
+
+IpcLegacySysprof2 *ipc_legacy_impl_new (void);
+
+G_END_DECLS