replace embeded snappy by latest offical version

[gulu-goolu]

What problem does this PR solve?

使用了官方最新的 snappy 替换了 butil 下面的 third_party 中的版本

Issue Number: https://github.com/apache/brpc/issues/3014

Problem Summary:

What is changed and the side effects?

Changed:

Side effects:

• Performance effects:

• Breaking backward compatibility:

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Check List:

• Please make sure your changes are compilable.
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