[Cin] July release of AppImages

[Phyllis Smith]

The AppImages for July are now available at:
   https://cinelerra-gg.org/download/images/

Unfortunately, the upgrade of OpenEXR  as credited to Manuel V can not be
done because I struggled and struggled to find a way to use
"without-openexr" to also exclude Imath and could not find a way even tried
checking cmake version to exclude and it still uses "forced" for Imath.  I
do not want to prevent older distrros having "cmake" lower than the
required 3.12 from building; as long as they can build correctly
"without-openexr'".  Hopefully, a solution is still viable.

Next following the work of Andrew and testing by Andrea will be testing the
FFmpeg 5.1 upgrade.

**********************************************************************************************************
*GIT for Cinelerra-GG has the following changes from 07/01/2022-07/31/2022*
Library upgrades for the following:
  Libaom to 3.4.0 from 3.2.0
  Libvpx to 1.12.0 from 1.11.0
Minor patches to configure.ac for needed configuration changes by Andrew.
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