fix(scanner/base) export libFile struct

[sadayuki-matsuno]

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What did you implement:

export libFile struct

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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Is this ready for review?: YES

Reference

• https://blog.github.com/2015-01-21-how-to-write-the-perfect-pull-request/