Revert "Added "-d detect_unicode=0" to the php shebang to work around https://bugs.php.net/bug.php?id=36711."

This reverts commit 045ae0e5ce.

src/Composer/Compiler.php

@@ -110,7 +110,7 @@ class Compiler
     private function getStub()
     {
         return <<<'EOF'
-#!/usr/bin/env php -d detect_unicode=0
+#!/usr/bin/env php
 <?php
 /*
  * This file is part of Composer.