tests: Reduce compilation time and unneccessary recompiles by removing unused includes in tests

src/test/hash_tests.cpp

@@ -2,13 +2,12 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <clientversion.h>
 #include <crypto/siphash.h>
 #include <hash.h>
 #include <util/strencodings.h>
 #include <test/setup_common.h>
 
-#include <vector>
-
 #include <boost/test/unit_test.hpp>
 
 BOOST_FIXTURE_TEST_SUITE(hash_tests, BasicTestingSetup)