Document portable parallel build with CMake (#889)
Document portable parallel build with CMake (#889)

Signed-off-by: Jean-Francois Panisset <76f95a908bec300c259a5833da7c9676b2781c29@gmail.com>
AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO