Fix build break: Bump pybind11 required version to 2.6.1 (#1228)
Fix build break: Bump pybind11 required version to 2.6.1 (#1228)

* Disable unneeded clang submodules

Signed-off-by: Michael Dolan <688080ba093bba32b8050b0536b1c7a964e2656e@gmail.com>

* Bump pybind11 required version to 2.6.1

Signed-off-by: Michael Dolan <688080ba093bba32b8050b0536b1c7a964e2656e@gmail.com>
AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO