Mk/Uses/inotify.mk: Add USES=inotify
FreeBSD 15 includes the inotify system in base, but anything prior to 15
needs the libinotify port. This USES script makes it a little easier to
depend on and use the correct thing.
Reviewed by: mat
Approved by: mat
Differential Revision: https://reviews.freebsd.org/D54116