Update.

Update.

	* posix/unistd.h (socklen_t): Define if it has not yet happened.
	(gethostname): Change type of second parameter to socklen_t.
	* include/unistd.h (__gethostname): Change type of second
	parameter to socklen_t.
	* sysdeps/generic/gethostname.c (__gethostname): Likewise.
	* sysdeps/mach/hurd/gethostname.c (__gethostname): Likewise.
	* sysdeps/unix/sysv/gethostname.c (__gethostname): Likewise.
	* sysdeps/unix/sysv/sysv4/solaris2/gethostname.c (__gethostname):
	Likewise.
	* sysdeps/unix/sysv/linux/gethostname.c: Removed.
	* sysdeps/generic/bits/socket.h: Use __socklen_t to define socklen_t.
	Allow definition elsewhere.
	* sysdeps/unix/sysv/aix/bits/socket.h: Likewise.
	* sysdeps/unix/sysv/linux/bits/socket.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/bits/socket.h: Likewise.
	* sysdeps/generic/bits/types.h: Define __socklen_t.
	* sysdeps/unix/sysv/aix/bits/types.h: Likewise.
	* sysdeps/unix/sysv/hpux/bits/types.h: Likewise.
	* sysdeps/unix/sysv/linux/alpha/bits/types.h: Likewise.
	* sysdeps/unix/sysv/linux/bits/types.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/bits/types.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/types.h: Likewise.
	* sysdeps/unix/sysv/sysv4/solaris2/bits/types.h: Likewise.