Mark error message in qfsfileengine_unix.cpp as translatable.

Task-number: QTBUG-35594
Change-Id: I7aeab890a5972813f38370ff20f5b68839833e3b
Reviewed-by: David Faure <david.faure@kdab.com>
Windows: Remove rarely used integration/theming logging categories.

Preparing the introduction of the categorized logging system for the
plugin.

Change-Id: I2b180d88cf508559f495d39d4e1d36b8f3da7051
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
Remove unimplemented constructor in QTextEngine

QTextEngine(LayoutData*) declaration seems to have been added in
Qt 4.1 without an implementation. As far as I can see it has
never been implemented.

Change-Id: I4bbf032395f7c930c9e8d365cdbbcf47bb118d64
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
constify some functions to improve readability

Change-Id: I4a5e68367f281f743a631272f57a848dc2833d12
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
remove qt_windows.h from qwinoverlappedionotifier_p.h

Preparation for making QWinOverlappedIoNotifier public.

Change-Id: Id443514a134b5c13e64d4d89450a7912ab38d40f
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>