tst_QJSEngine::toFixed() will fail on i386

[Timo Jyrinki]

Update: These tests actually weren't being executed in Ubuntu before.

With the to-be-uploaded new patch version of Qt 5.6.1, the function will start to fail on i386 and i386 only:

FAIL! : tst_QJSEngine::toFixed() Compared values are not the same
   Actual (result.toString()) : "12.0"
   Expected (QStringLiteral("12.1")): "12.1"
   Loc: [tst_qjsengine.cpp(3797)]

Also failing are seven other similar tests:
FAIL! : tst_qqmlqt::rect() Compared values are not the same
   Actual (qvariant_cast<QRectF>(object->property("test2"))): QRectF(-10,13 100x109.6) (bottomright 90,122.6)
   Expected (QRectF(-10, 13, 100, 109.6)) : QRectF(-10,13 100x109.6) (bottomright 90,122.6)
   Loc: [tst_qqmlqt.cpp(277)]
FAIL! : tst_qqmlqt::point() Compared values are not the same
   Actual (qvariant_cast<QPointF>(object->property("test2"))): QPointF(-3,109.2)
   Expected (QPointF(-3, 109.2)) : QPointF(-3,109.2)
   Loc: [tst_qqmlqt.cpp(298)]
FAIL! : tst_qqmlqt::size() Compared values are not the same
   Actual (qvariant_cast<QSizeF>(object->property("test2"))): QSizeF(3x109.2)
   Expected (QSizeF(3, 109.2)) : QSizeF(3x109.2)
   Loc: [tst_qqmlqt.cpp(318)]
FAIL! : tst_qqmlqt::vector2d() Compared values are not the same
   Loc: [tst_qqmlqt.cpp(338)]
FAIL! : tst_qqmlqt::vector3d() Compared values are not the same
   Loc: [tst_qqmlqt.cpp(358)]
FAIL! : tst_qqmlqt::vector4d() Compared values are not the same
   Loc: [tst_qqmlqt.cpp(378)]
FAIL! : tst_qqmlqt::quaternion() Compared values are not the same
   Loc: [tst_qqmlqt.cpp(398)]