luaPackages.lrexlib: mark as broken

Doesn't build neither with 5.1 nor 5.2 lua.

Changed files
+1
pkgs
top-level
+1
pkgs/top-level/lua-packages.nix
···
homepage = "https://github.com/lua-stdlib/lua-stdlib/";
hydraPlatforms = stdenv.lib.platforms.linux;
license = stdenv.lib.licenses.mit;
+
broken = true;
};
};