Bundle d3dcompiler_47.dll for Tor Browser 8

See: https://bugzilla.mozilla.org/show_bug.cgi?id=1460620 and the related fxc/fxc2-sage (https://bugzilla.mozilla.org/show_bug.cgi?id=1370007) for context. But regardless we need to bundle d3dcompiler_47.dll as we are otherwise risking breaking Tor Browser for a bunch of users.

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