* sysdeps/unix/sysv/linux/alpha/bits/fcntl.h (splice): Add offin

* sysdeps/unix/sysv/linux/alpha/bits/fcntl.h (splice): Add offin

	and offout arguments to the prototype.
	* sysdeps/unix/sysv/linux/s390/bits/fcntl.h (splice): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/bits/fcntl.h (splice): Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/fcntl.h (splice): Likewise.
	* sysdeps/unix/sysv/linux/sh/bits/fcntl.h (splice): Likewise.
	* sysdeps/unix/sysv/linux/i386/bits/fcntl.h (splice): Likewise.
	* sysdeps/unix/sysv/linux/ia64/bits/fcntl.h (splice): Likewise.
	* sysdeps/unix/sysv/linux/x86_64/bits/fcntl.h (splice): Likewise.
	* sysdeps/unix/sysv/linux/syscalls.list (splice): Adjust args string.