[Predef-contribute] open64 prefeds

[Paul H. <phh...@lb...>]

You already have that __OPENCC__ is the identifying symbol for Open64.
I can add that __OPENCC__ is the compiler's major version
and __OPENCC_MINOR__ is the minor number, both are integers.
Additionally, __OPENCC_PATCHLEVEL__ is a patch level but is NOT always an
integer (e.g. "3.2" without the quotes).
Finally __OPEN64__ is a version string

-- 
Paul H. Hargrove                          PHH...@lb...
Future Technologies Group
Computer and Data Sciences Department     Tel: +1-510-495-2352
Lawrence Berkeley National Laboratory     Fax: +1-510-486-6900