Ignore generated files
Fixed bug causing issue "tap-windows6 9.21.0 hangs forever when writing".

In TapDeviceWrite driver was returning STATUS_PENDING without marking the IRP as pending by calling IoMarkIrpPending.

Evidently OpenVPN itself does not exercise the faulty code path.

This is commit of source change only. Binaries muts be rebuilt.
Merge remote-tracking branch 'upstream/master' into xpbuild