[RFC]: add C implementation for @stdlib/math/base/special/xlog1py

[kawaho2]

Description

This RFC proposes adding C implementation for @stdlib/math/base/special/xlog1py

Related Issues

Related issues #649 .

Questions

No.

Other

No.

Checklist

• I have read and understood the Code of Conduct.
• Searched for existing issues and pull requests.
• The issue name begins with RFC:.

[kawaho2]

working on it.