Fix another x86 sys/ucontext.h namespace issue (bug 21457)

[Andreas Schwab]

On Jun 16 2017, Joseph Myers <joseph@codesourcery.com> wrote:

> 	[BZ #21457]
> 	* sysdeps/unix/sysv/linux/x86/sys/ucontext.h [__x86_64__] (struct
> 	_libc_xmmreg): Use __ctx in defining field.

Ok.

Andreas.

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Andreas Schwab, SUSE Labs, schwab@suse.de
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