winextras: Fix compilation with MSVC 2008.

MSVC 2008 is lacking operator | for the enumerations, some defines
and has a different signature for ITaskbarList3::ThumbBarAddButtons().

Task-number: QTBUG-35980

Change-Id: I8ac49e7f2f12d122df077ff33c2451b5258e36a0
Reviewed-by: Ivan Vizir <define-true-false@yandex.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>