Update GModelIO_CGNS for libcgns scoped enums (Fixes #340)
I believe this is the fix for #340 (closed) (and #320 (closed) for that matter), though it's difficult to confirm if this will be necessary for all systems/architectures.
I believe this is the fix for #340 (closed) (and #320 (closed) for that matter), though it's difficult to confirm if this will be necessary for all systems/architectures.