Update to latest versions of cmake, libxml2 (and libxml2-python),
graphviz, python3, libgpg-error, libx265 and ffmpeg.
Downgrade wxWidgets to 3.0.5 because newer versions require a 10.10
target but we are still targeting 10.7.
python3 has fixed linking to static openssl and libiconv/libintl
upstream, the only thing necessary now is adding -liconv -lintl to
EXTRA_LIBS.
It was necessary to override -std=gnu++17 with -std=gnu++11 for some
sources because of issues like register variables not being allowed in
C++17. This was done in EXTRA_CXXFLAGS.
c2man and graphviz were removed from the mac build for now, there are
issues with them with the newest build tools and they are only
documentation tools.
Make some other minor adjustments to get everything to build. A trivial
patch for ffmpeg also needs to be sent upstream.
The next step is automated mac nightly builds.
Signed-off-by: Rafael Kitover <rkitover@gmail.com>
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