windeployqt: Adapt to dynamic GL switching.

Add command line options to enable or disable deployment of ANGLE.
Detect dependency on ANGLE from platform plugin. Detect true
if neither a dependency on ANGLE nor opengl32.dll exists (dynamic case).

Task-number: QTBUG-36545
Change-Id: Ic46b93fa79ca2527e08b780862e699ab12e2861c
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>