add linux support for libargon2

src/SPC/builder/linux/library/libargon2.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\builder\linux\library;
+
+class libargon2 extends LinuxLibraryBase
+{
+    use \SPC\builder\unix\library\libargon2;
+
+    public const NAME = 'libargon2';
+}