stat,tail: fix android build and support inotify

stat,tail: fix android build and support inotify

* src/extract-magic: Treat android like linux,
which fixes the build by ensuring the constants are defined.
* src/stat.c: Support all constants on android, including
the android specific "sdcardfs".
* src/tail.c: Fix inclusion of statfs headers to be independent
of inotify availability, as fremote() is used on linux even
if inotify has been disabled.  Also enable fremote() on android.
* NEWS: Mention the improvment.
Fixes https://bugs.gnu.org/34239