for getmntinfo() returning its result in struct statvfs.
* m4/fstypename.m4: Update to serial#6, which replaces
HAVE_F_FSTYPENAME_IN_STATFS with HAVE_STRUCT_STATFS_F_FSTYPENAME.
* src/mountlist.c: Sync with gnulib.
All uses of HAVE_F_FSTYPENAME replaced by HAVE_STRUCT_STATFS_F_FSTYPENAME.
[MOUNTED_GETMNTINFO2] Include sys/statvfs.h.
(read_file_system_list) [MOUNTED_GETMNTINFO2]: Implement.
mount and file system information with m4_includes of the corresponding
GNU coreutils-5.94 files (ls-mntd-fs.m4 (#20) and fsusage.m4 (#16)).
* m4/fsusage.m4, m4/ls-mntd-fs.m4: Create.