Bug#417986: transcend noisy on amd64 caused by portaudio

[Joshua Judson Rosen]

cf. bug #433381: "libportaudio0: does not run/work at all on amd64, audio -> white noise"

I applied the patch that's attached to that bug, rebuilt & reinstalled
libportaudio0 and libportaudio-dev, rebuilt transcend against the
modified portaudio, and transcend now works beautifully on my amd64
system.

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