* acinclude.m4 (AC_GET_FS_INFO): Add a check to determine whether
getmntinfo() takes struct statvfs instead of struct statfs as its
first argument. Define MOUNTED_GETMNTINFO_STATVFS if it does.
Add a check to determine whether struct statvfs has a field named
f_fstypename.
Use gl_FSTYPENAME tp determine whether struct statfs has a field
named f_fstypename.
* src/mountlist.c (HAVE_F_FSTYPENAME): Define when getmntinfo() is
used and the struct which it fills has a field named f_fstypename.
(read_filesystem_list) [MOUNTED_GETMNTINFO]: Use
MOUNTED_GETMNTINFO_STATVFS to determine the type of the first
argument to getmntinfo().
