This patch updates struct signalfd_siginfo in sys/signalfd.h with new
members from Linux 4.18 (plus ssi_addr_lsb, added to the kernel in
2.6.37 without being added to sys/signalfd.h at that time). The
__pad2 member name follows the kernel and the existing __pad name.
Tested for x86_64.
* sysdeps/unix/sysv/linux/sys/signalfd.h (struct
signalfd_siginfo): Add ssi_addr_lsb, ssi_syscall, ssi_call_addr
and ssi_arch members.
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