Add missing asm-ppc/seccomp.h. Must learn to use git properly.

#ifndef _ASM_SECCOMP_H

#include <linux/unistd.h>

#define __NR_seccomp_read __NR_read

#define __NR_seccomp_write __NR_write

#define __NR_seccomp_exit __NR_exit

#define __NR_seccomp_sigreturn __NR_rt_sigreturn

#endif /* _ASM_SECCOMP_H */