Remove LOCK_EX That Breaks Cache Usage on NFS

This removes the exclusive lock that was introduced in symfony#24960.

NFS File Systems do not support exclusive locking, and generates a lot
of errors every time you try to do anything with che cache.

Author: brianfreytag

src/Symfony/Component/HttpKernel/Kernel.php

@@ -423,7 +423,7 @@ public function setClassCache(array $classes)
      */
     public function setAnnotatedClassCache(array $annotatedClasses)
     {
-        file_put_contents(($this->warmupDir ?: $this->getCacheDir()).'/annotations.map', sprintf('<?php return %s;', var_export($annotatedClasses, true)), LOCK_EX);
+        file_put_contents(($this->warmupDir ?: $this->getCacheDir()).'/annotations.map', sprintf('<?php return %s;', var_export($annotatedClasses, true)));
     }
 
     /**