filesystems.5: Note ncpfs removal from kernel
Relevant Linux commits:
* moved to staging in
1bb8155080c652c4853e6228f8f0d262b3049699
(describe:
v4.15-rc1-129-g1bb8155080c6) in Nov 2017,
described as "broken" and "obsolete"
* purged in
bd32895c750bcd2b511bf93917bf7ae723e3d0b6
(describe:
v4.17-rc3-1010-gbd32895c750b) in Jun 2018,
"since no one has complained or even noticed it was gone"
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>