Add PIE support (#249)

Author: asgrim

composer.json

@@ -0,0 +1,12 @@
+{
+    "name": "nikic/php-ast",
+    "type": "php-ext",
+    "license": "BSD-3-Clause",
+    "description": "Extension exposing PHP 7 abstract syntax tree",
+    "require": {
+        "php": ">= 7.2.0"
+    },
+    "php-ext": {
+        "extension-name": "ast"
+    }
+}