* guix/build/download.scm (http-fetch): Rename `bv' to `bv-or-port'. Use `http-get*' followed by `dump-port' when the former is available, and pass a progress procedure to `dump-port'.
* guix/build/download.scm (http-fetch): Rename `bv' to `bv-or-port'. Use `http-get*' followed by `dump-port' when the former is available, and pass a progress procedure to `dump-port'.