arm: fix compilation warning

Fix "dereferencing type-punned pointer will break strict-aliasing rules"
warning introduced by commit v4.8-54-g670b21b.

* signal.c (sys_sigreturn) [ARM]: Avoid dereferencing type-punned pointers.
Check for SA_RESTORER definition in <asm/signal.h>

Kernel header <asm/signal.h> cannot be included from regular code
because it conflicts with libc headers, but SA_RESTORER is needed in
signal.c, so SA_RESTORER value is forwarded from <asm/signal.h> to
config.h using a configure check.

* configure.ac (ASM_SA_RESTORER): Define if SA_RESTORER is defined
in <asm/signal.h>.
Fix sigaction reporting on non-x86 architectures

If SA_RESTORER is not defined by libc headers but defined by kernel
headers, use the definition provided by kernel headers for proper
sigaction decoding.

* signal.c [!SA_RESTORER]: Define to ASM_SA_RESTORER if the latter is
defined, regardless of architecure.
tests: tighten sigaction check

* tests/sigaction.awk: Check that input conatins all expected lines.
Revert "Add support for Altera's Nios-II softcore architecture"

The patch originally submitted by Ezequiel García was OK, but I somehow
managed to mangle it so that most of the patch was not applied.

According to Ezequiel García, an architecture port based on the generic
syscall ABI is in progress.

This reverts commit 61e426e87ac81be4b4ff9de581635b4ea585624f.
Do not compile scsi ioctl decoding if <scsi/sg.h> is not available

Add a generic test for <scsi/sg.h> availability to fix build with
Bionic libc that does not provide <scsi/sg.h>.

* configure.ac (AC_CHECK_HEADERS): Add scsi/sg.h.
* ioctl.c (ioctl_decode): Do not call scsi_ioctl if !HAVE_SCSI_SG_H.
* scsi.c: Do not compile scsi ioctl decoding if !HAVE_SCSI_SG_H.

Reported-by: Elliott Hughes <enh@google.com>
powerpc64: fix 64-bit process detection on embedded

* syscall.c (get_scno) [POWERPC64]: Fix 64-bit process detection
on embedded powerpc.

Signed-off-by: James Yang <james.yang@freescale.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
Fix build with Bionic libc

Add generic tests for fopen64 and fputs_unlocked functions to fix build
with Bionic libc that does not provide them.

* configure.ac (AC_CHECK_FUNCS): Add fopen64 and fputs_unlocked.
* strace.c [_LARGEFILE64_SOURCE]: Use fopen instead of fopen64
if !HAVE_FOPEN64.
Use fputs instead of fputs_unlocked if !HAVE_FPUTS_UNLOCKED.
* vsprintf.c: Use fputs instead of fputs_unlocked
if !HAVE_FPUTS_UNLOCKED.

Reported-by: Elliott Hughes <enh@google.com>