add lz4 extension

src/SPC/builder/extension/lz4.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SPC\builder\extension;
+
+use SPC\builder\Extension;
+use SPC\util\CustomExt;
+
+#[CustomExt('lz4')]
+class lz4 extends Extension
+{
+    public function getUnixConfigureArg(bool $shared = false): string
+    {
+        return '--enable-lz4 --with-lz4-includedir=' . BUILD_ROOT_PATH;
+    }
+
+    public function getWindowsConfigureArg(): string
+    {
+        return '--enable-lz4';
+    }
+}