Do not enforce include <glib-object.h> to be as plain C

because it can lead to FTBFS.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 4e6cff8b1d)

kipi-plugins/ipodexport/plugin_ipodexport.cpp

@@ -11,9 +11,7 @@
  *                                                                         *
  ***************************************************************************/
 
-extern "C" {
 #include <glib-object.h> //g_type_init
-}
 
 #include "ipodexportdialog.h"
 #include "plugin_ipodexport.h"