luarocks: 2.4.4 -> 3.0.4

Some new features like test_dependencies/build_dependencies and flags ( --lua-versions)
that should make nix integration easier:
https://github.com/luarocks/luarocks/blob/master/CHANGELOG.md

pkgs/development/tools/misc/luarocks/darwin.patch

@@ -1,20 +1,20 @@
-diff --git a/src/luarocks/cfg.lua b/src/luarocks/cfg.lua
-index 55cd4c9..060a6f1 100644
---- a/src/luarocks/cfg.lua
-+++ b/src/luarocks/cfg.lua
-@@ -587,9 +587,9 @@ if cfg.platforms.macosx then
+diff --git a/src/luarocks/core/cfg.lua b/src/luarocks/core/cfg.lua
+index f93e67a..2eb2db9 100644
+--- a/src/luarocks/core/cfg.lua
++++ b/src/luarocks/core/cfg.lua
+@@ -425,9 +425,9 @@ local function make_defaults(lua_version, target_cpu, platforms, home)
        defaults.external_lib_extension = "dylib"
-    defaults.arch = "macosx-"..cfg.target_cpu
+       defaults.arch = "macosx-"..target_cpu
        defaults.variables.LIBFLAG = "-bundle -undefined dynamic_lookup -all_load"
 -      defaults.variables.STAT = "/usr/bin/stat"
 +      defaults.variables.STAT = "stat"
        defaults.variables.STATFLAG = "-f '%A'"
--   local version = io.popen("sw_vers -productVersion"):read("*l")
+-      local version = util.popen_read("sw_vers -productVersion")
 +      local version = "10.10"
        version = tonumber(version and version:match("^[^.]+%.([^.]+)")) or 3
        if version >= 10 then
           version = 8
-@@ -598,8 +598,8 @@ if cfg.platforms.macosx then
+@@ -436,8 +436,8 @@ local function make_defaults(lua_version, target_cpu, platforms, home)
        else
           defaults.gcc_rpath = false
        end

pkgs/development/tools/misc/luarocks/default.nix

@@ -7,16 +7,13 @@
 , cmake
 }:
 
-let
-in
-
 stdenv.mkDerivation rec {
   pname = "luarocks";
-  version="2.4.4";
+  version = "3.0.4";
 
   src = fetchurl {
     url="http://luarocks.org/releases/luarocks-${version}.tar.gz";
-    sha256="0d7rl60dwh52qh5pfsphgx5ypp7k190h9ri6qpr2yx9kvqrxyf1r";
+    sha256="1pqfzwvjy8dzqg4fqjq2cgqcr00fgrdd7nwzxm7nqmawr83s6dhj";
   };
 
   patches = [ ./darwin.patch ];