Bug 1113291. Reenable DisplayLink blocking on Windows. r=bas

Bug 1107299 broke this blocking because it assumed that DoesD3D11DeviceWork()
only described whether texture sharing works. However we were also checking for
broken DisplayLink drivers in that function. This splits out that part and uses
it appropriately.

--HG--
extra : rebase_source : 895d2da6297a48d0a2cbef2d149c27471c788484