sysinfo.c: ignore ptrace_peeksiginfo_args from <linux/ptrace.h>

With some versions of glibc and GNU/Linux ptrace_pseeksiginfo_args is
defined in both <sys/ptrace.h> and <linux/ptrace.h>. We don't actually
care about the struct, so use a #define to avoid a redefinition error.

This fixes https://gcc.gnu.org/PR81324.

Change-Id: Ide04efe871da21f1a55f646a8f42a4f4283d9c50
Reviewed-on: https://go-review.googlesource.com/49290
Reviewed-by: Than McIntosh <thanm@google.com>
1 file changed