net/czmq4: Update to 4.1.0
Additional port changes:
* Moved relevant lines into the USExx section
* Added 2 patches from the maintainer
Shared library soname didn't change, but headers were
reformatted, it is hard to tell if anything really changed there.
Submitted by: Kenji Rikitake <firstname.lastname@example.org> (maintainer)
Approved by: tcberner (mentor, implicit)