[aur-requests] [PRQ#3042] Merge Request for protobuf-cpp

sarum9in [1] filed a request to merge protobuf-cpp [2] into protobuf3 [3]: I implemented proper packaging for protobuf3, python-protobuf3 and python2-protobuf3 as in extra/protobuf package. This package is replaced by protobuf3. [1] https://aur.archlinux.org/account/sarum9in/ [2] https://aur.archlinux.org/pkgbase/protobuf-cpp/ [3] https://aur.archlinux.org/pkgbase/protobuf3/