PATCH: eliminate some endian #ifs

[Ulrich Drepper]

Greg McGary <greg@mcgary.org> writes:

> I refined this a bit further: __LONG_LONG_SPLIT accepts a single
> 64-bit quantity, breaks it into two 32-bit args, and passes the pieces
> according to __BYTE_ORDER.

The macro does not belong in endian.h.  Remove it there.  The rest is OK.

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