[apache/incubator-teaclave] builtin function question (#427)

[gjj]

I added a built-in function that requires a third-party library, but I reported 
an error when compiling.

![image](https://user-images.githubusercontent.com/30582212/97081619-1e759700-1636-11eb-9aaf-c43a7ca24f76.png)

This bag is in https://crates.io/ It exists

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