Remove pre-2.4 Linux kernel support

[David Miller]

From: David Miller <davem@davemloft.net>
Date: Tue, 22 May 2012 17:51:13 -0400 (EDT)

> From: "Joseph S. Myers" <joseph@codesourcery.com>
> Date: Tue, 22 May 2012 21:22:49 +0000 (UTC)
> 
>> Tested x86.  Could S390, SH and SPARC maintainers review / test the
>> changes to their ports, and someone review the patch as a whole?
> 
> I'll look this over and test it on sparc, thanks a lot for doing
> this work Joseph.

All of my sparc build and testsuite runs passed with flying colors,
and the sparc specific changes look fine too.

Thanks.