Migrate project to use Magnus + rb_sys

Author: lautis

Cargo.lock

@@ -1,4 +1,3 @@
 source 'https://rubygems.org'
 
-# Specify your gem's dependencies in rscsv.gemspec
 gemspec

Gemfile

@@ -1,9 +1,27 @@
 require 'bundler/gem_tasks'
-require 'bundler/setup'
 require 'rspec/core/rake_task'
-import 'lib/tasks/helix_runtime.rake'
+require 'rake/extensiontask'
+require 'rb_sys'
 
 RSpec::Core::RakeTask.new(:spec)
 
-task :spec => :build
-task :default => :spec
+GEMSPEC = Gem::Specification.load('rscsv.gemspec')
+
+Rake::ExtensionTask.new('rscsv', GEMSPEC) do |ext|
+  ext.lib_dir = 'lib/rscsv'
+  ext.source_pattern = '*.{rs,toml}'
+  ext.cross_compile = true
+  ext.cross_platform = %w[
+    x86_64-linux
+    x86_64-linux-musl
+    aarch64-linux
+    aarch64-linux-musl
+    x86_64-darwin
+    arm64-darwin
+    x64-mingw-ucrt
+    x64-mingw32
+  ]
+end
+
+task spec: :compile
+task default: [:compile, :spec]