Take enginio as a part of Qt5 build

Change-Id: I92e93b3b0d564e5a0a2fc69775b7cfcc955e0926
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>
Submodule version number parsed from .qmake.conf before syncqt.pl

For more info look:
https://bugreports.qt-project.org/browse/QTBUG-37791

Change-Id: I6553446d632903b90e87cf3ef5e4a405302b9bcb
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>