set encoding for SQLcl

Author: hito4t

embulk-input-oracle/src/test/java/org/embulk/input/oracle/OracleTests.java

@@ -37,7 +37,7 @@ public static void execute(TestingEmbulk embulk, String sql) throws IOException
                 "sql",
                 user + "/" + password + "@" + host + ":" + port + "/" + database,
                 "@" + sqlFile.toFile().getAbsolutePath());
-        pb.environment().put("NLS_LANG", "American_America.UTF8");
+        pb.environment().put("JAVA_TOOL_OPTIONS", "-Dfile.encoding=UTF8");
         pb.redirectErrorStream(true);
         int code;
         try {