leveldb: Include <algorithm> in util/env_test.cc.
CL 170738066 introduced std::min and std::max to env_test.cc. These
require the <algorithm> header.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171024062
diff --git a/util/env_test.cc b/util/env_test.cc
index 8717752..0bf7121 100644
--- a/util/env_test.cc
+++ b/util/env_test.cc
@@ -4,6 +4,8 @@
#include "leveldb/env.h"
+#include <algorithm>
+
#include "port/port.h"
#include "util/testharness.h"
#include "util/testutil.h"
