[regression] x86/signal/64: Fix SS handling for signals delivered to 64-bit programs breaks dosemu

[Stas Sergeev]

Hi guys, I wonder how easily the include/uapi/* is being
changed these days.
The patch:
http://lkml.kernel.org/r/405594361340a2ec32f8e2b115c142df0e180d8e.1426193719.git.luto@xxxxxxxxxx
breaks dosemu (and perhaps everyone else who used
to restore the segregs by hands). And the fix involves
both autoconf magic and run-time magic, so it is not even
trivial.
I realize this patch may be good to have in general, but
breaking userspace without a single warning is a bit
discouraging. Seems like the old "we don't break userspace"
rule have gone.
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