Fix some packaging defects raised in debian

I noticed various bug reports at http://bugs.debian.org/cgi-bin/pkgreport.cgi?repeatmerged=no&src=xbmc needed attention so here is a pull request which matches the package uploaded to http://mentors.debian.net/package/xbmc

```
xbmc (2:12.2-1.1) experimental; urgency=low

  * Non-maintainer upload.
  * XBMC 12.2 Frodo. Closes: #716806
  * Disable hal support. Closes: #676702 Closes: #668486
  * Add 01-Compile-against-system-libavcodec.patch and
    02-Fix-avcodec-vdpau-detection.patch
    (Closes: #706193)
  * Fix typo in package description: "archiecture". Closes: #706826 

 -- macmenot <notmemac@gmail.com>  Thu, 03 Oct 2013 21:05:29 +0100
```