x86/headers: Unify 'struct sigcontext_ia32' and 'struct sigcontext_32'

The two structures are identical - merge them and keep the
legacy name as a define.

Acked-by: Mikko Rapeli <mikko.rapeli@iki.fi>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1441438363-9999-13-git-send-email-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/include/uapi/asm/sigcontext32.h

@@ -5,30 +5,4 @@
 
 #include <asm/sigcontext.h>
 
-/* 32-bit compat sigcontext: */
-struct sigcontext_ia32 {
-       __u16				gs, __gsh;
-       __u16				fs, __fsh;
-       __u16				es, __esh;
-       __u16				ds, __dsh;
-       __u32				di;
-       __u32				si;
-       __u32				bp;
-       __u32				sp;
-       __u32				bx;
-       __u32				dx;
-       __u32				cx;
-       __u32				ax;
-       __u32				trapno;
-       __u32				err;
-       __u32				ip;
-       __u16				cs, __csh;
-       __u32				flags;
-       __u32				sp_at_signal;
-       __u16				ss, __ssh;
-       __u32				fpstate;	/* Pointer to 'struct _fpstate_32' */
-       __u32				oldmask;
-       __u32				cr2;
-};
-
 #endif /* _ASM_X86_SIGCONTEXT32_H */