Build clean-up for the mirsink changes

Signed-off-by: Ricardo Salveti de Araujo <ricardo.salveti@canonical.com>
gstamcvideodechybris: add proper support for new qualcomm colorspace

Based on a patch by Jorge Luis Zapata <jzapata@fluendo.com>, from
upstream.

Signed-off-by: Ricardo Salveti de Araujo <ricardo.salveti@canonical.com>
Merge pull request #3 from rsalveti/packaging

Packaging and build fixes