From 90228fc110303549aa1d4d86083bf585df8624c3 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 23 Dec 2012 03:33:38 -0500
Subject: [PATCH] switch compat_sys_sigaltstack() to COMPAT_SYSCALL_DEFINE

Makes sigaltstack conversion easier to split into per-architecture
parts.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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