hurd: Fix F_*LK* fcntl with __USE_FILE_OFFSET64

hurd: Fix F_*LK* fcntl with __USE_FILE_OFFSET64

struct flock64 uses 64bit values. This introduces other values for F_GETLK,
F_SETLK, F_SETLKW to distinguish between both.

	* sysdeps/mach/hurd/bits/fcntl.h (F_GETLK64, F_SETLK64, F_SETLKW64): New
	macros
	[__USE_FILE_OFFSET64] (F_GETLK, F_SETLK, F_SETLKW): Define to F_GETLK64,
	F_SETLK64, F_SETLKW64, respectively.
	* sysdeps/mach/hurd/f_setlk.c: New file.
	* sysdeps/mach/hurd/f_setlk.h: New file.
	* sysdeps/mach/hurd/Makefile [$(subdir) = io] (sysdeps_routines): Add
	f_setlk.
	* sysdeps/mach/hurd/fcntl.c: Include "f_setlk.h".h".
	(__libc_fcntl): Move non-flock operations to...
	* sysdeps/mach/hurd/vfcntl.c (__libc_vfcntl): ... New file.
	* sysdeps/mach/hurd/fcntl.c (fcntl64): Add missing alias.