irc/soju previously USES=go:no_target to disable the usual Go Port building infrastructure and instead rely on the upstream project's makefile to build. This made it difficult to reason about how port-provided flags finally get passed into the build.
This change uses the Porter's Handbook suggested method of porting Go applications as described here https://docs.freebsd.org/en/books/porters-handbook/book/#using-go. It removes the USES=go:no_target in order to use the FreeBSD Go application build infrastructure.
I've build and run tested this change.