WT-2352: Allow build and test without requiring lz4

Remove support for the bzip2 compression engine.

examples/java/com/wiredtiger/examples/ex_all.java

@@ -516,12 +516,6 @@ session_ops(Session session)
      * the code snippets, use if (false) to avoid running it.
      */
     if (false) {  // MIGHT_NOT_RUN
-    /*! [Create a bzip2 compressed table] */
-    ret = session.create("table:mytable",
-        "block_compressor=bzip2,key_format=S,value_format=S");
-    /*! [Create a bzip2 compressed table] */
-    ret = session.drop("table:mytable", null);
-
     /*! [Create a lz4 compressed table] */
     ret = session.create("table:mytable",
         "block_compressor=lz4,key_format=S,value_format=S");
@@ -899,13 +893,6 @@ allExample()
      * be installed, causing the open to fail.  The documentation requires
      * the code snippets, use if (false) to avoid running it.
      */
-    /*! [Configure bzip2 extension] */
-    conn = wiredtiger.open(home,
-        "create," +
-        "extensions=[/usr/local/lib/libwiredtiger_bzip2.so]");
-    /*! [Configure bzip2 extension] */
-    conn.close(null);
-
     /*! [Configure lz4 extension] */
     conn = wiredtiger.open(home,
         "create," +