[#2838] Fix compilation with qt4.6 and make sure nothing is broken for older releases

sflphone-client-kde/src/AccountWizard.cpp

@@ -18,6 +18,7 @@
  *   Free Software Foundation, Inc.,                                       *
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  ***************************************************************************/
+#include <unistd.h>
 #include "AccountWizard.h"
 #include <QVBoxLayout>
 #include <QFormLayout>

sflphone-client-kde/src/SFLPhone.cpp

@@ -21,6 +21,7 @@
  
 #include "SFLPhone.h"
 
+#include <unistd.h>
 #include <KApplication>
 #include <KStandardAction>
 #include <KMenuBar>

sflphone-client-kde/src/main.cpp

+#include <unistd.h>
+
 #include <QApplication>
 #include <QtCore/QString>
 #include <QtGui/QMenu>