PATCH RFA: Remove extern "C" from java header file

[Andrew Haley]

Bryce McKinlay wrote:
> 
> I think this is just a hangover from when the verifier was originally
> ported from the C++ version in the runtime. I can't think of a reason
> to have it - the verifier implementation is not actually shared
> between the front end and the runtime, so it can be removed.

Thanks for the reminder.  I agree, the patch is fine.

Andrew.