Remove pre-2.4.21 Linux kernel support

[Andreas Schwab]

"Joseph S. Myers" <joseph@codesourcery.com> writes:

> A fair amount of the patch deals with some macros defined and used
> only for powerpc; could a powerpc maintainer review / test these
> changes?

All 64-bit architectures use the wordsize-64 variants which do not
depend on __ASSUME_FCNTL64, __ASSUME_STAT64_SYSCALL or
__ASSUME_MMAP2_SYSCALL, so these macros can be removed.

__ASSUME_VFORK_SYSCALL is now always defined for all relevant
architectures (which is only i386, m68k and ppc/ppc64; arm doesn't use
it), thus it can be removed as well.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
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