Backported GNU Ring and dependencies

helpers/make-argon2

helpers/make-ffmpeg

helpers/make-gnutls28

helpers/make-libmysofa

helpers/make-libopenmpt

helpers/make-libsecp256k1

helpers/make-libtasn1-6

helpers/make-libunistring

helpers/make-msgpack

helpers/make-opendht

helpers/make-restbed

helpers/make-ring

helpers/make-unbound