Add zig package (#4960)

packages/zig.rb

+require 'package'
+
+class Zig < Package
+  description 'Programming language designed for robustness, optimality, and clarity'
+  homepage 'https://ziglang.org/'
+  version '0.7.1'
+  compatibility 'x86_64 aarch64'
+  source_url 'https://ziglang.org/download/0.7.1/zig-0.7.1.tar.xz'
+  source_sha256 '2db3b944ab368d955b48743d9f7c963b8f96de1a441ba5a35e197237cc6dae44'
+
+ def self.build
+   Dir.mkdir 'build'
+   FileUtils.cd('build') do
+     system "cmake #{CREW_CMAKE_OPTIONS} .."
+     system 'make'
+   end
+ end
+ def self.install
+   FileUtils.cd('build') do
+     system "DESTDIR=#{CREW_DEST_DIR} make install"
+   end
+  end
+end