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

From: Stas Sergeev
Date: Tue Aug 11 2015 - 20:18:08 EST

Hi guys, I wonder how easily the include/uapi/* is being
changed these days.
The patch:
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
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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