Add libatomic_ops

packages/libatomic_ops.rb

+require 'package'
+
+class Libatomic_ops < Package
+  description 'Atomic memory update operations portable implementation'
+  homepage 'https://github.com/ivmai/libatomic_ops'
+  version '7.6.0'
+  source_url 'https://github.com/ivmai/libatomic_ops/releases/download/v7.6.0/libatomic_ops-7.6.0.tar.gz'
+  source_sha256 '8e2c06d1d7a05339aae2ddceff7ac54552854c1cbf2bb34c06eca7974476d40f'
+
+  def self.build
+    system "./configure"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end