Fixed rounding errors in QtQuick1 to int conversions

qRound introduced errors when qreal is single precision. Added
double signature for qround so that string and int don't lose precision
in conversion.

Task-number: QTBUG-33625

Change-Id: I58582f57d5cd68fcad3fe9efb5fea5935f61b9e3
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
WebKit: Remove video support on OS X

WebKit video support on OS X currently relies on QTKit to function
properly. This is problematic because QTKit video support in WebKit
requires linking against the WebKitSystemInterface specific to each OS X
release, thus preventing the same set of Qt binaries from interoprating
with several Mac Releases. As a workaround video support is disabled.

Back ported from: http://trac.webkit.org/changeset/151546

Task-number: QTBUG-32237

Change-Id: I780062ce5971960dcad7b51e6226dcf7cd7c907f
Reviewed-by: Michael Bruning <michael.bruning@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>