Bug#690029: transcode: allow to compile on !linux archs

[Pino Toscano]

Source: transcode
Version: 3:1.1.7-3
Severity: normal
Tags: patch

Hi,

currently transcode uncoditionally enables alsa and v4l, which are
Linux-only systems, causing build failures on non-Linux architectures.
The attached patch enables them only on Linux (restricting the alsa
build dependency too), allowing to compile transcode at least on
kFreeBSD (on Hurd it fails due to PATH_MAX, but that's another story).

Thanks,
-- 
Pino
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