[ANGLE] Fix compilation with MSVC2013 Update4

Update4 provides a native Sleep implementation. Hence the wrapper
needs to be disabled.

Change-Id: I162da45934b02c262ac09b557c66c3363c276e54
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Oliver Wolff <oliver.wolff@theqtcompany.com>
Fix crash when Android Style is set more than once.

Load again JSON document is it was freed.

Task-number: QTBUG-43111
Change-Id: I22f1de221371b49fec8b3d66ad5f0bd2af9656fe
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>