tail,stat: improve support for the IBRIX file system

tail,stat: improve support for the IBRIX file system

Note that IBRIX used to have a different magic number 0x013111A7
instead of the current 0x013111A8.  However, the former is no longer
used and the version of IBRIX it was used in is really ancient, so
it's extremely unlikely anyone is still using it.  Therefore, just
add the newer magic number.
Mark IBRIX as a 'remote' file system type as inotify support had
never been officially tested with it.

* src/stat.c (human_fstype): Add file system ID definition.
* NEWS: Mention the improvement.

Fixes http://bugs.gnu.org/19951