GCC with LTO sees through our hack:
qprintdialog_unix.cpp:212:7: warning: type ‘struct QPrintDialogPrivate’ violates the C++ One Definition Rule [-Wodr]
qabstractprintdialog.cpp:49:7: note: a different type is defined in another translation unit
This hack was there so that the QPrintDialog functions in
qabstractprintdialog.cpp could use the d pointer. So instead of hacking
around the issue, just use the class that this file has access to:
QAbstractPrintDialogPrivate.
Change-Id: I3840d727dee443318644fffd1528e2e8b814e983
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>