ocio build fix for Windows
report by email and patch by Benoit Bolsee

"It is a basic compilation bug (variable defined in a c file and declared
in the c++ file: name decoration will change the name in the c++ file
and the linker will not find it)"

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@60664 954f8c5b-7b00-dc11-b283-0030488c597c