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diff --git a/external/unbound/util/random.h b/external/unbound/util/random.h
deleted file mode 100644
index a05a994a3..000000000
--- a/external/unbound/util/random.h
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
- * util/random.h - thread safe random generator, which is reasonably secure.
- * 
- * Copyright (c) 2007, NLnet Labs. All rights reserved.
- * 
- * This software is open source.
- * 
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 
- * Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 
- * Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 
- * Neither the name of the NLNET LABS nor the names of its contributors may
- * be used to endorse or promote products derived from this software without
- * specific prior written permission.
- * 
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef UTIL_RANDOM_H
-#define UTIL_RANDOM_H
-
-/**
- * \file
- * Thread safe random functions. Similar to arc4random() with an explicit
- * initialisation routine.
- */
-
-/**
- * random state structure.
- */
-struct ub_randstate;
-
-/**
- * Initialize the system randomness.  Obtains entropy from the system
- * before a chroot or privilege makes it unavailable. 
- * You do not have to call this, otherwise ub_initstate does so.
- * @param seed: seed value to create state (if no good entropy is found).
- */
-void ub_systemseed(unsigned int seed);
-
-/**
- * Initialize a random generator state for use 
- * @param seed: seed value to create state contents.
- *	(ignored for arc4random).
- * @param from: if not NULL, the seed is taken from this random structure.
- * 	can be used to seed random states via a parent-random-state that
- * 	is itself seeded with entropy.
- * @return new state or NULL alloc failure.
- */
-struct ub_randstate* ub_initstate(unsigned int seed, 
-	struct ub_randstate* from);
-
-/**
- * Generate next random number from the state passed along.
- * Thread safe, so random numbers are repeatable.
- * @param state: must have been initialised with ub_initstate.
- * @return: random 31 bit value.
- */
-long int ub_random(struct ub_randstate* state);
-
-/**
- * Generate random number between 0 and x-1.  No modulo bias.
- * @param state: must have been initialised with ub_initstate.
- * @param x: an upper limit. not (negative or zero). must be smaller than 2**31.
- * @return: random value between 0..x-1. Possibly more than one
- * random number is picked from the random stream to satisfy this.
- */
-long int ub_random_max(struct ub_randstate* state, long int x);
-
-/**
- * Delete the random state.
- * @param state: to delete.
- */
-void ub_randfree(struct ub_randstate* state);
-
-#endif /* UTIL_RANDOM_H */