New port: devel/delve

Delve is a debugger for the Go programming language. The goal of the project is
to provide a simple, full featured debugging tool for Go. Delve should be easy
to invoke and easy to use. Chances are if you're using a debugger, things
aren't going your way. With that in mind, Delve should stay out of your way as
much as possible.

WWW: https://github.com/go-delve/delve

PR: 243962
Submitted by: Dmitry Wagin <dmitry.wagin@ya.ru>