Env should also load the native library (#6167)

Summary:
Closes https://github.com/facebook/rocksdb/issues/6118
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6167

Differential Revision: D19053577

Pulled By: pdillinger

fbshipit-source-id: 86aca9a5bec0947a641649b515da17b3cb12bdde

java/src/main/java/org/rocksdb/Env.java

@@ -13,6 +13,10 @@ import java.util.List;
  */
 public abstract class Env extends RocksObject {
 
+  static {
+    RocksDB.loadLibrary();
+  }
+
   private static final Env DEFAULT_ENV = new RocksEnv(getDefaultEnvInternal());
   static {
     /**