Make ubuntu cmake hack do yes up go now
Crash fix for empty media URL.

Apparently LLViewerMediaImpl::navigateInternal could be called with
an empty url. That lead to a curl request with an empty url, which
failed because that leads to an empty 'service' string, which is
not allowed.

Patched the code to ignore empty media urls and hardened AICurl
to deal with any remaining cases.
Avoid long viewer freezes when region doesn't have reverse DNS.

Some opensim servers might not have a reverse DNS, which causes
a stall of up to 5 seconds for each call. This means that
every time you up the parcel music stream (or any other media)
the viewer would freeze six times 5 seconds.. 30 seconds.

With this patch it only freeze once ;) (when you enter a region).
It already did that before (too), but after that opening the
parcel media doesn't freeze the viewer at all anymore.
Merge remote-tracking branch 'singu/master'
Merge branch 'master' of git://github.com/LightDrake/SingularityViewer