Revert "Merge branch 'staging-next'"

This reverts commit 41af38f372, reversing
changes made to f0fec244ca.

Let's delay this.  We have some serious regressions.

pkgs/servers/sql/mariadb/connector-c/3_1.nix

@@ -1,6 +0,0 @@
-{ callPackage, ... } @ args:
-
-callPackage ./. (args // {
-  version = "3.1.2";
-  sha256 = "0pgz8m8d39mvj9wnjll6c83xvdl2h24273b3dkx0g5pxj7ga4shm";
-})

pkgs/servers/sql/mariadb/connector-c/default.nix

@@ -1,54 +0,0 @@
-{ stdenv, fetchurl, cmake
-, curl, openssl, zlib
-, libiconv
-, version, sha256, ...
-}:
-
-with stdenv.lib;
-
-stdenv.mkDerivation {
-  pname = "mariadb-connector-c";
-  inherit version;
-
-  src = fetchurl {
-    urls = [
-      "https://downloads.mariadb.org/f/connector-c-${version}/mariadb-connector-c-${version}-src.tar.gz"
-      "https://downloads.mariadb.com/Connectors/c/connector-c-${version}/mariadb-connector-c-${version}-src.tar.gz"
-    ];
-    inherit sha256;
-  };
-
-  cmakeFlags = [
-    "-DWITH_EXTERNAL_ZLIB=ON"
-    "-DMYSQL_UNIX_ADDR=/run/mysqld/mysqld.sock"
-    "-DWITH_CURL=ON"
-  ];
-
-  # The cmake setup-hook uses $out/lib by default, this is not the case here.
-  preConfigure = optionalString stdenv.isDarwin ''
-    cmakeFlagsArray+=("-DCMAKE_INSTALL_NAME_DIR=$out/lib/mariadb")
-  '';
-
-  nativeBuildInputs = [ cmake ];
-  propagatedBuildInputs = [ curl openssl zlib ];
-  buildInputs = [ libiconv ];
-
-  enableParallelBuilding = true;
-
-  postFixup = ''
-    ln -sv mariadb_config $out/bin/mysql_config
-    ln -sv mariadb $out/lib/mysql
-    ln -sv mariadb $out/include/mysql
-    ln -sv libmariadbclient.a $out/lib/mariadb/libmysqlclient.a
-    ln -sv libmariadbclient.a $out/lib/mariadb/libmysqlclient_r.a
-    ln -sv libmariadb.so $out/lib/mariadb/libmysqlclient.so
-    ln -sv libmariadb.so $out/lib/mariadb/libmysqlclient_r.so
-  '';
-
-  meta = {
-    description = "Client library that can be used to connect to MySQL or MariaDB";
-    license = licenses.lgpl21;
-    maintainers = with maintainers; [ globin ];
-    platforms = platforms.all;
-  };
-}