Bug#791490: Package libgpac3 should be libgpac4

[Alessio Treglia]

I started a build here [1], please have a look at the result.

[1] http://debomatic-amd64.debian.net/distribution#unstable/gpac/0.5.2-426-gc5ad4e4+dfsg5-1/

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Alessio Treglia          | www.alessiotreglia.com
Debian Developer         |     alessio at debian.org
Ubuntu Core Developer    |  quadrispro at ubuntu.com
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