[PATCH][SH] Fix setjmp.h for C++

[Andrew Stubbs]

This patch fixes the following glibc tests for SH4:

FAIL: build debug/tst-chk4.o
FAIL: build debug/tst-chk5.o
FAIL: build debug/tst-chk6.o
FAIL: build debug/tst-lfschk4.o
FAIL: build debug/tst-lfschk5.o
FAIL: build debug/tst-lfschk6.o

The problem is that they are compiled with the C++ compiler, and that objects 
to unnamed types.

This patch simply gives the struct a name. It is much the same as (part of) 
this patch for m68k: 
http://sourceware.org/ml/libc-ports/2008-08/msg00005.html

OK?

Andrew
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