ANGLE: Fix MSVC compiler warning

We don't use exceptions anyway, so we can safely ignore this warning.

Task-number: QTBUG-32833

Change-Id: Id78cb99770f37a076de3a95721ba40795a8a7b57
Reviewed-by: Andrew Knight <andrew.knight@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Kai Koehne <kai.koehne@digia.com>