Remove pre-2.2 Linux kernel support

[Andreas Jaeger]

On Tuesday, May 08, 2012 21:46:07 Joseph S. Myers wrote:
> I propose this patch to remove compatibility code for kernels before
> 2.2.x as a first step in cleaning up the no-longer-useful old kernel
> support.  Tested x86.  Could the powerpc, sh and sparc maintainers
> test and review the changes to their architectures' code?  Because
> this patch with lots of reindentation may not be very readable, I've
> also attached a diff -w version.

This looks fine to me. With the testing done by David and Ryan, let's submit 
this.

Please add a NEWS entry stating that pre-2.2 Linux kernel support was 
removed.

I see a couple of further cleanups that I suggest will be done on this:

Hurd folks, do we still need testrtsig.h? IMO we should be able to remove 
it.

Files like sysdeps/unix/sysv/linux/powerpc/chown.c looks now obsolete, we 
can use syscalls.list for it. Ryan, could you check this file? Not sure 
whether there are further files.

The powerpc and sh pread/pwrite calls might be able to use the linux 
version. Ryan and Kaz, could you look at these, please?

David, I guess that after the change 
sysdeps/unix/sysv/linux/sparc/sparc32/sigaction.c can be removed. Please 
check this.

Thanks,
Andreas
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