Remove WWW entries moved into port Makefiles
Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.
This commit removes the WWW: lines of moved-over URLs from these
Approved by: portmgr (tcberner)
Add a package for ARPC.
ARPC is an RPC library similar to GRPC. Though a lot simpler than GRPC
featurewise, it has transparent support for file descriptor passing.
ARPC is used by some applications related to CloudABI, like Flower
(CloudABI's networking daemon).
Reviewed by: riggs
Differential Revision: https://reviews.freebsd.org/D12103