* sysdeps/unix/sysv/linux/bits/statvfs.h: Change type of f_fsid field
to unsigned long. Add __f_unused. Define _STATVFSBUF_F_UNUSED.
* sysdeps/unix/sysv/linux/internal_statvfs.c: Adjust initialization of
f_fsid field after change in struct statvfs.
* sysdeps/unix/sysv/linux/alpha/bits/statvfs.h: New file.
* sysdeps/unix/sysv/linux/ia64/bits/statvfs.h: New file.
* sysdeps/unix/sysv/linux/sparc/sparc64/bits/statvfs.h: New file.
* conform/data/sys/stat.h-data: Remove isfdtype. Use
optional-macro.
