GitLab is used only for code review, issue tracking and project management. Canonical locations for source code are still https://gitweb.torproject.org/ https://git.torproject.org/ and git-rw.torproject.org.
There is no need to ship libwinprthread when compiling tor with mingw-w64-clang. See: #31584 (moved) for context.
Note this is strictly speaking a parent ticket for #29321 (moved). However, Trac thinks any child can only have one parent. So, here we are.