GCC 4.7 fixes.

Thanks to Francois Andriot.
(cherry picked from commit 4ff6a82b0a)

sip/kdecore/kaccel.sip

@@ -35,7 +35,7 @@ public:
                          KAccel (QWidget* /TransferThis/, const char* = 0);
                          KAccel (QWidget*, QObject* /TransferThis/, const char* = 0);
     KAccelActions&       actions ();
-    bool                 isEnabled () const;
+    bool                 isEnabled ();
     void                 setEnabled (bool);
     bool                 setAutoUpdate (bool);
 

sip/kdecore/kaccelbase.sip

@@ -48,7 +48,7 @@ public:
                          KAccelBase (int);
     uint                 actionCount () const;
     KAccelActions&       actions ();
-    bool                 isEnabled () const;
+    bool                 isEnabled ();
     KAccelAction*        actionPtr (const QString&);
     KAccelAction*        actionPtr (const KKey&);
     KAccelAction*        actionPtr (const KKeyServer::Key&);

sip/kdecore/kglobalaccel.sip

@@ -33,7 +33,7 @@ class KGlobalAccel : QObject
 
 public:
                          KGlobalAccel (QObject*, const char* = 0);
-    bool                 isEnabled () const;
+    bool                 isEnabled ();
     void                 setEnabled (bool);
     KAccelAction*        insert (const QString&, const QString&, const QString&, const KShortcut&, const KShortcut&, SIP_RXOBJ_CON, SIP_SLOT_CON (), bool = 1, bool = 1);