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Re: glibc preparation patch for lockf support in Hurd

If we were starting from scratch, we'd use 64-bit types unconditionally.
But given that we already have off_t that is sometimes 32 bits, we should
be consistent with the other systems that have this distinction.  That
means F_GETLK64 should be a different value from F_GETLK in the ABI, and
F_GETLK gets that value under __USE_FILE_OFFSET64 (where 'struct flock'
also gets the 'struct flock64' layout).

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