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/uwsgi/default.nix

@@ -4,7 +4,7 @@
 , pam, withPAM ? stdenv.isLinux
 , systemd, withSystemd ? stdenv.isLinux
 , python2, python3, ncurses
-, ruby, php-embed, libmysqlclient
+, ruby, php-embed, mysql
 }:
 
 let pythonPlugin = pkg : lib.nameValuePair "python${if pkg.isPy2 then "2" else "3"}" {
@@ -34,7 +34,7 @@ let pythonPlugin = pkg : lib.nameValuePair "python${if pkg.isPy2 then "2" else "
                     # usage: https://uwsgi-docs.readthedocs.io/en/latest/PHP.html#running-php-apps-with-nginx
                     path = "plugins/php";
                     inputs = [ php-embed ] ++ php-embed.buildInputs;
-                    NIX_CFLAGS_LINK = [ "-L${libmysqlclient}/lib/mysql" ];
+                    NIX_CFLAGS_LINK = [ "-L${mysql.connector-c}/lib/mysql" ];
                   })
                 ];