rubyPackages.msgpack: drop nonexistent dependency on msgpack

, libiconv, postgresql, v8, clang, sqlite, zlib, imagemagick, lasem

, pkg-config , ncurses, xapian, gpgme, util-linux, tzdata, icu, libffi

, cmake, libssh2, openssl, openssl_1_1, libmysqlclient, git, perl, pcre, pcre2, gecode_3, curl

, msgpack, libsodium, snappy, libossp_uuid, lxc, libpcap, xorg, gtk2, gtk3, buildRubyGem

, libsodium, snappy, libossp_uuid, lxc, libpcap, xorg, gtk2, gtk3, buildRubyGem

, cairo, expat, re2, rake, gobject-introspection, gdk-pixbuf, zeromq, czmq, graphicsmagick, libcxx

, file, libvirt, glib, vips, taglib, libopus, linux-pam, libidn, protobuf, fribidi, harfbuzz

, bison, flex, pango, python3, patchelf, binutils, freetds, wrapGAppsHook, atk

    '';

  };

  msgpack = attrs: {

    buildInputs = [ msgpack ];

  };

  mysql = attrs: {

    buildInputs = [ libmysqlclient zlib openssl ];

  };