Review: Added OCIO_VERSION_HEX to public header for easy version comparison


Jeremy Selan <jeremy...@...>
 

https://github.com/imageworks/OpenColorIO/pull/112

This exposes a single 4-byte hex number, e.g. 0x01050200 == 1.5.2

Use this for numeric comparisons, e.g. #if OCIO_VERSION_HEX >= ...
Note: in the case where SOVERSION is overridden at compile-time, this
will reflect the original API version number.

Code concept is stolen from cpython source.

Addresses issue
https://github.com/imageworks/OpenColorIO/issues/65

-- Jeremy