Windows: Display a message box if platform plugin cannot be found.

Task-number: QTBUG-31765
Task-number: QTBUG-31760

Change-Id: Iadfabccf7be755564e313a8f0c128f533b9bd024
Reviewed-by: Kai Koehne <kai.koehne@digia.com>
tst_qfilefialog: Fix leaking temporary directories.

The test currently leaks 2 directories QFileDialogTestDir,
QFileDialogTestDir4SelectFiles in /tmp.

Change-Id: I396f0b069572a680d81206dd0f1ddf606cbbe9e4
Reviewed-by: David Faure (KDE) <faure@kde.org>
QtPrintSupport: Initialize UI of widget-based dialog.

Remove virtual from QPageSetupDialogPrivate::init() (which was
called from the constructor) and keep it as a non-virtual
function for QUnixPageSetupDialogPrivate.

Fix breakage introduced by
54b899f44877d87f6118b1bab02fb67c35d738e8 .

Task-number: QTBUG-31790
Change-Id: I6d552bc250e4d72c1bb50eceadd2852b1b957aea
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
remove pointless variables

Change-Id: Ia4cd2292bdea49c198ee1429ab4d3f87697c3ed1
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
simplify qmake call

the directory is sufficient nowadays.
the unix configure already did it that way.

Change-Id: I887e5ad594aef1f7bf5f4f92a6bdf0a13e4d0372
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
remove pointless qmake -o argument

it's already done by the working directory.
the unix configure already did it that way.

Change-Id: Ia88d0877a2e24bc40a7083c2164982dec47f913b
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
introduce "secret" configure -top-level option

shifts the makefile generation one directory level up.
this allows the top-level configure to leave the makefile creation
entirely to the qtbase configure.
this is not very clean modularization-wise, but consistent with -skip.

Change-Id: I7ee2d2f29f2e6619d61fe9b55faa0bacdf3c44c1
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>