fanotify.c: fix typo in header inclusion

the header is included only as a guard to check that the declaration
and definition match, so the typo didn't cause any breakage aside
from omitting this check.

src/linux/fanotify.c

 #include "syscall.h"
-#include <sys/inotify.h>
+#include <sys/fanotify.h>
 
 int fanotify_init(unsigned flags, unsigned event_f_flags)
 {