open-scene-graph 3.1.2

Upgrade open-scene-graph to version 3.1.2.
Remove that patch that is merged into this version.
Add a `--docs` option. Don't build them by default.
Add deps on doxygen and graphviz if building docs.
Install the docs into the correct path.
Add a dep on gnuplot.
Add a dep on gtkglext.
Add an option to build ffmpeg support. It is off by default.
Make the ffmpeg dep conditional on the option.
Use inreplace to turn off ffmpeg rather than 10 CMake vars.
Actually build the docs using `make doc_openscenegraph` if asked.
Remove the `fails_with` because it works now.
Add a patch to fix a syntax error during `cmake`, missing OR.
Change to 10.7 specific cmake code to `10.7 or 10.8`.
Reported upstream and noted removal date in comments.
Tested on ML using clang and llvm from XCode-4.4.1.

Fixes #13840

Closes #14563.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

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