[OpenAFS] clarification on client caches

[Wes Chow]

> >>Why would it need to be conditional on AFS_64BIT_ENV?  Linux supports
> >>the "long long" 64-bit integer type natively in the 32bit OS just fine.

> AFS_64BIT_ENV *means* long long support, so... in fact Derek seems to have 
> secretly meant it's safe to set.

Ah, I thought he meant, "since Linux natively supports long long, why
do we need to explicitly tell it to add AFS 64 bit support?"  My bad.

Wes

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