devel/py-capstone: Update to 4.0.1

devel/py-capstone has to be kept in sync with its Capstone library. At the
moment, there are two versions of the library in ports: devel/capstone3 and
devel/capstone4. The version 3 is an old version of the library so the
bindings should be updated to follow version 4, which is the newest major
version.

Currently, there is no need to introduce a port with Python bindings
compatible with Capstone 3 as there are no known ports dependant on version
3 of the bindings.

Some ports need to be updated so that they depend on devel/capstone4
instead of devel/capstone3 to avoid build problems. They will be updated in
subsequent commits.

Also, set NO_ARCH while here.

Approved by: koobs (maintainer)
Differential Revision: https://reviews.freebsd.org/D23751