Remove DIALOGS_MAJOR_MINOR define in QtQuick.Dialogs code
Remove DIALOGS_MAJOR_MINOR define in QtQuick.Dialogs code

It's unconvenient with it to extent Dialogs to multiple versions.

Change-Id: I8c7059921875764dc74f80321caebfad16965a6a
Reviewed-by: Shawn Rutledge <7b40856c8c1100512025516d7c58756d644d9e8d@digia.com>

matthewvogt/qtdeclarative,mgrunditz/qtdeclarative-2d,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,qmlc/qtdeclarative,mgrunditz/qtdeclarative-2d,matthewvogt/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,matthewvogt/qtdeclarative,mgrunditz/qtdeclarative-2d,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,qmlc/qtdeclarative,matthewvogt/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,mgrunditz/qtdeclarative-2d,mgrunditz/qtdeclarative-2d,mgrunditz/qtdeclarative-2d,mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative