Support absolute symlinks

Author: thekid

src/main/php/xp/lambda/PackageLambda.class.php

@@ -38,7 +38,8 @@ private function add(ZipArchiveWriter $zip, Path $path, Path $base, $prefix= '')
     // - Files: Add to ZIP
     // - Folders: Recursively add all subfolders and files therein
     if (Sources::IS_LINK === ($stat['mode'] & Sources::IS_LINK)) {
-      $resolved= $path->parent()->resolve(readlink($path))->asRealpath($base);
+      $target= new Path(readlink($path));
+      $resolved= Path::real($target->isAbsolute() ? $target : [$path->parent(), $target], $base);
       if ($resolved->exists()) {
         $base= $resolved->isFile() ? new Path(dirname($resolved)) : $resolved;
         yield from $this->add($zip, $resolved, $base, $relative.DIRECTORY_SEPARATOR);