unix: add fanotify API on Linux

This teaches unix/mksyscall.go about mapping uint64 to syscall
arguments, similar to existing handling of int64.

Change-Id: I536b4b09bbf6a8e3016565a4a04d2b9d32cbc624
Reviewed-on: https://go-review.googlesource.com/c/164664
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>

unix/linux/types.go

@@ -48,6 +48,7 @@ package unix
 #include <sys/utsname.h>
 #include <sys/wait.h>
 #include <linux/errqueue.h>
+#include <linux/fanotify.h>
 #include <linux/filter.h>
 #include <linux/icmpv6.h>
 #include <linux/if_pppox.h>
@@ -1680,3 +1681,9 @@ const (
 // Socket error queue
 
 type SockExtendedErr C.struct_sock_extended_err
+
+// Fanotify
+
+type FanotifyEventMetadata C.struct_fanotify_event_metadata
+
+type FanotifyResponse C.struct_fanotify_response