• Updated to 1.3.3
• Cleanup Makefile
• Removed STRIP var, stripping go is always safe[1].

[1] https://dominik.honnef.co/posts/2016/10/go-and-strip/

PR: 221561
Submitted by: Ari Suutari
Reviewed by: matthew (mentor), mat
Approved by: matthew (mentor), cheffo (maintainer)
Differential Revision: https://reviews.freebsd.org/D12121