Provide Haproxy with Lua support

[fuzzy-id]

Issue description

At the moment Haproxy is built without the support of external Lua scripts. I managed to build a Haproxy with Lua support with the following config:

nixpkgs.config.packageOverrides = pkgs : rec {
  haproxy = pkgs.haproxy.overrideDerivation (oldAttrs : {
    buildInputs = oldAttrs.buildInputs ++ [pkgs.lua5_3];
    preConfigure = oldAttrs.preConfigure + ''makeFlags+=" USE_LUA=yes LUA_LIB=${pkgs.lua5_3}/lib LUA_INC=${pkgs.lua5_3}/include"'';
  });
};

Is there interest in having Haproxy with Lua support in nixpkgs? If so, I would like to contribute this as it seems like a nice first-starter.

Technical details

• System: (NixOS: nixos-version, Ubuntu/Fedora: lsb_release -a, ...)

16.09.1829.c88e67d (Flounder)

• Nix version: (run nix-env --version)

nix-env (Nix) 1.11.7

• Nixpkgs version: (run nix-instantiate --eval '<nixpkgs>' -A lib.nixpkgsVersion)

"16.09.1829.c88e67d"

[Mic92]

I have no concerns and it seems to be also adopted by other downstream distributions.

[0xABAB]

The solution I would like to see in general is to by default include all dependencies (or alternatively those used by popular distributions), but allow flags to be passed to disable features.

This way it's possible to first get something working and then in production disable unneeded features.

[fuzzy-id]

Implemented by #24380.