Fix sparc64 bits/setjmp.h namespace (bug 21261)

[Mike Frysinger]

On 17 Mar 2017 03:08, Joseph Myers wrote:
> sysdeps/unix/sysv/linux/sparc/bits/setjmp.h defines 64-bit __jmp_buf
> with a load of identifiers that are not part of any standard
> namespace, resulting in conform/ tests failing.  This patch fixes this
> by moving those identifiers to the implementation namespace, so
> enabling the conform/ tests to pass for sparc64.

lgtm
-mike
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