[SH][PATCH] fix headers for new kernel headers

[Andrew Stubbs]

>> I tried Andrew's patch. It worked for compiling glibc itself, but
>> 'struct user' is needed for compile native gdb. So I modified the patch as follows
>> and then succeeded.

I tried your patch and it did not work for me. The problem is that 
including asm/ptrace.h polutes the namespace and prevents use of 
ptrace.h from glibc.

This patch is a combination of the two patches, with fixes for my problems.

This patch includes some #undef directives to sort out the namespace 
clashes. I know there were objections to this idea when I posted 
something like this before, but really, I can't find a better solution. 
It may be better to patch the kernel headers, but, in reality, people 
don't (can't) always use the latest kernel, and it's much better to fix 
glibc to work with all recent kernels anyway.

If I don't use asm/ptrace.h then I have to copy pretty much the entire 
contents into glibc, but if I do use asm/ptrace.h there are a few 
problem macros which aren't going to just go away.

There's a precident for doing this; sparc has the same problem.

Hopefully I've also fixed all the formatting issues.

Please approve and apply this version.

Andrew
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