remove useless files

[ghost]

Warnings are found on analyzing the commit 13228048fcc12e648b29dc8cc6d68d8d7a936a3e.

1 warning:

• ⚠️ Goodcheck

We recommend to address them as possible, for example, update outdated dependencies, fix the tool's configuration, configure sider.yml, turn off unused tools, and so on.

If you are struggling with these errors or warnings, feel free to ask us via chat. 💬

[fisco-dev]

Here is an overview of what got changed by this pull request:

Clones removed
==============
+ .ci/ethPrecompiled/bn256.go  -1
+ .ci/ethPrecompiled/bn256_gm.go  -1

See the complete overview on Codacy