feat: support rockspec's build_dependencies

[teto]

first seen in the wild in std.normalize

Fixes #31

[codecov-commenter]

Codecov Report

Merging #32 (24965b4) into master (e94733b) will increase coverage by 0.24%.
Report is 1 commits behind head on master.
The diff coverage is 0.00%.

❗ Current head 24965b4 differs from pull request most recent head 063fd0f. Consider uploading reports for the commit 063fd0f to get more accurate results

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@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   81.16%   81.41%   +0.24%     
==========================================
  Files          91       92       +1     
  Lines       11660    11696      +36     
==========================================
+ Hits         9464     9522      +58     
+ Misses       2196     2174      -22     

Files	Coverage Δ
src/luarocks/cmd/nix.lua	8.13% <0.00%> (-0.06%)	⬇️

... and 3 files with indirect coverage changes

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[teto]

Looks like it is working

$ wget https://raw.githubusercontent.com/lua-stdlib/normalize/master/std.normalize-git-1.rockspec 
$ luarocks nix ./std.normalize-git-1.rockspec 
Warning: Lua 5.1 interpreter not found at lua

Modules may not install with the correct configurations. You may want to configure the path prefix to your build of Lua 5.1 using

   luarocks config --local lua_dir <your-lua-prefix>

sh: line 1: lua/lua: No such file or directory
Call to nix-prefetch-git --fetch-submodules --quiet https://github.com/lua-stdlib/normalize.git failed
{ buildLuarocksPackage, fetchgit, ldoc, luaAtLeast, luaOlder, std-_debug }:
buildLuarocksPackage {
  pname = "std.normalize";
  version = "git-1";

  src = fetchgit ( removeAttrs (builtins.fromJSON ''{
  "url": "https://github.com/lua-stdlib/normalize.git",
  "rev": "01307e4e6cc3a2d3eba907d3a6758bcf0f3f09e2",
  "date": "2023-02-03T19:18:59-07:00",
  "path": "/nix/store/wnvhj9mma8j5j5wmgj5ih2c548gvn5ic-normalize",
  "sha256": "0bh8sz8lv67yjkzf4i1a75c4ywdx5rsgf063ixxw0fqrc7kazaz5",
  "hash": "sha256-5auv5mEZO8B7j8MA93QuvXFPWDkqROL+lP6YTdHXCC4=",
  "fetchLFS": false,
  "fetchSubmodules": true,
  "deepClone": false,
  "leaveDotGit": false
}
 '') ["date" "path" "sha256"]) ;

  disabled = luaOlder "5.1" || luaAtLeast "5.5";
  nativeBuildInputs = [ ldoc ];
  propagatedBuildInputs = [ std-_debug ];

  meta = {
    homepage = "https://lua-stdlib.github.io/normalize";
    description = "Normalized Lua Functions";
    license.fullName = "MIT/X11";
  };
}