Generate config.h

This allows us to remove a lot of #ifdef's. Either we want to use
a config.h or we don't. Since we'll want it for e.g. optional gsound
support later on let's have it.

src/config.h.in

@@ -0,0 +1,4 @@
+/*
+ * Autogenerated by the Meson build system.
+ * Do not edit, your changes will be lost.
+ */

src/meson.build

@@ -4,7 +4,10 @@ dbus_src = gnome.gdbus_codegen(
     join_paths(meson.source_root() / 'data' / 'dbus', 'sm.puri.OSK0.xml')
 )
 
+config_h = configure_file(input: 'config.h.in', output: 'config.h',configuration: conf_data)
+
 sources = [
+  config_h,
   'imservice.c',
   'server-context-service.c',
   'server-main.c',

src/server-context-service.c

@@ -15,9 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif  /* HAVE_CONFIG_H */
 
 #include <gtk/gtk.h>
 #include <glib/gi18n.h>

src/server-main.c

@@ -23,9 +23,7 @@
 #include <gtk/gtk.h>
 #include <glib/gi18n.h>
 
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif  /* HAVE_CONFIG_H */
 
 #if HAVE_CLUTTER_GTK
 #include <clutter-gtk/clutter-gtk.h>