Remove Hildon framework support.

The Hildon framework was used for Nokia 770 and other Maemo devices.
This platform discontinued and hasn't seen a new release since 2011.

src/generic/notifmsgg.cpp

@@ -22,15 +22,7 @@
     #pragma hdrstop
 #endif
 
-#ifndef wxUSE_LIBHILDON
-    #define wxUSE_LIBHILDON 0
-#endif
-
-#ifndef wxUSE_LIBHILDON2
-    #define wxUSE_LIBHILDON2 0
-#endif
-
-#if wxUSE_NOTIFICATION_MESSAGE && (!wxUSE_LIBHILDON || !wxUSE_LIBHILDON2)
+#if wxUSE_NOTIFICATION_MESSAGE
 
 #ifndef WX_PRECOMP
     #include "wx/dialog.h"
@@ -42,8 +34,8 @@
 #include "wx/artprov.h"
 
 // even if the platform has the native implementation, we still normally want
-// to use the generic one (unless it's totally unsuitable for the target UI as
-// is the case of Hildon) because it may provide more features, so include
+// to use the generic one (unless it's totally unsuitable for the target UI)
+// because it may provide more features, so include
 // wx/generic/notifmsg.h to get wxGenericNotificationMessage declaration even
 // if wx/notifmsg.h only declares wxNotificationMessage itself (if it already
 // uses the generic version, the second inclusion will do no harm)
@@ -241,4 +233,4 @@ bool wxGenericNotificationMessage::Close()
     return true;
 }
 
-#endif // wxUSE_NOTIFICATION_MESSAGE && (!wxUSE_LIBHILDON || !wxUSE_LIBHILDON2)
+#endif // wxUSE_NOTIFICATION_MESSAGE