CMake: Fix issue that led to Unicode support still defaulting to off (#1594)
CMake: Fix issue that led to Unicode support still defaulting to off (#1594)

Signed-off-by: itsmattkc <90e625c3d5646439af76fbaa34078da1cab46658@users.noreply.github.com>
AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO,AcademySoftwareFoundation/OpenColorIO