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### _Why are the changes needed?_
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Fix bug.
### _How was this patch tested?_
Manual test with follow two cmd:
```
./build/dist --name 1.2.0-test --tgz -Pspark-3.1 -Pspark-hadoop-2.7 -Dspark.archive.mirror=https://mirrors.bfsu.edu.cn/apache/spark/spark-3.1.1
./build/dist --name 1.2.0-test --tgz -Pspark-3.1 -Pspark-hadoop-2.7 -Dspark.archive.mirror=https://mirrors.bfsu.edu.cn/apache/spark/spark-3.1.1 -Pkyuubi-extension-spark_3.1
```
Closes#639 from ulysses-you/fix-extension-package.
Closes#639
9852413 [ulysses-you] fix
Authored-by: ulysses-you <ulyssesyou18@gmail.com>
Signed-off-by: Kent Yao <yao@apache.org>
66dcf4564c