Include what you need: QIODevice

The qstdweb_p.h header declares subclasses of QIODevice and uses enum
types declared in QIODeviceBase, so make sure we include the QIODevice
header.

Change-Id: Id23da64105f998d52b114b529ce8493c74ed2364
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Pavel Dubsky <pavel.dubsky@qt.io>

src/corelib/platform/wasm/qstdweb_p.h

@@ -18,6 +18,7 @@
 #include <private/qglobal_p.h>
 #include <QtCore/qglobal.h>
 #include "QtCore/qhash.h"
+#include "QtCore/qiodevice.h"
 
 #include <emscripten/val.h>