Re-enable native print/pagesetup dialogs on Mac OS X

Re-enable native print/pagesetup dialogs on Mac OS X

Since QtPrintSupport does not have access to the internals of the print
engine on Mac OS X (it lives in the platform plugin). We instead use the
NSPrintInfoFromPrintEngine() invokable method in
QPlatformNativeInterface to return an NSPrintInfo* that we can use where
needed, or we use QPrintEngine::property()/setProperty() to communicate
with the engine.

This commit disables the generic UNIX dialogs and CUPS support on
Mac OS X, ensuring that the default format on Mac OS X is the
QPrinter::NativeFormat (previously qprinter.cpp would force PdfFormat as
default on Q_OS_UNIX which is also defined on Mac OS X).

The rest of the changes are straight forward porting. The methods:

extern void macStartInterceptWindowTitle(QWidget *window);
extern void macStopInterceptWindowTitle();

don't exist anymore, so don't use them. QMacCocoaAutoReleasePool also
doens't work, so use NSAutoreleasePool directly.

Change-Id: I341609e5efa53cadf8d174e4b282cbcae93e39e8
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>