[Cin] Latest GIT checkin + ubuntu16 without-vaapi build

[Phyllis Smith]

The latest GIT checkin contains many changes to draw refreshes in the
Compositor and Viewer windows.  A deadlock was recently discovered and it
was determined that Mutex-s were being used when Condition-s should have
been instead.  This is a very good cleanup and even though we did quite a
lot of testing, we could have missed something so if Cinelerra hangs
unexpectedly, please do a Ctrl-C and get a dmp file to send to us for
analysis.

IgorB: a ubuntu16 build without libva is available at the following URL.
Please let us know if this totally resolves your ./cin start up problem OR
if libvdpau has to be removed also.  It includes the above changes too
which needs to be used more by users so it is better tested.   gg/phyllis


https://www.cinelerra-gg.org/download/testing/cinelerra-5.1-ub16-without-vaapi-x86_64-static.txz
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