build: FindOpenColorIO failed to properly set OpenColorIO_VERSION (Ac…

…ademySoftwareFoundation#4196)

... in the OCIO 1.x case where we relied on our own Find module rather
than an exported cmake config from OCIO itself. This is desired for
uniformity of naming with the exported configs of the later versions.

Signed-off-by: Larry Gritz <lg@larrygritz.com>

src/cmake/modules/FindOpenColorIO.cmake

@@ -91,6 +91,7 @@ find_package_handle_standard_args (OpenColorIO
     )
 
 if (OpenColorIO_FOUND)
+    set (OpenColorIO_VERSION ${OPENCOLORIO_VERSION})
     set (OPENCOLORIO_INCLUDES ${OPENCOLORIO_INCLUDE_DIR})
     set (OPENCOLORIO_LIBRARIES ${OPENCOLORIO_LIBRARY})
     set (OPENCOLORIO_DEFINITIONS "")