fix file lock on SunOS

Author: fritzmg

src/Symfony/Component/Filesystem/LockHandler.php

@@ -75,12 +75,12 @@ public function lock($blocking = false)
             $error = $msg;
         });
 
-        if (!$this->handle = fopen($this->file, 'r')) {
+        if (!$this->handle = fopen($this->file, 'r+') ?: fopen($this->file, 'r')) {
             if ($this->handle = fopen($this->file, 'x')) {
                 chmod($this->file, 0444);
-            } elseif (!$this->handle = fopen($this->file, 'r')) {
+            } elseif (!$this->handle = fopen($this->file, 'r+') ?: fopen($this->file, 'r')) {
                 usleep(100); // Give some time for chmod() to complete
-                $this->handle = fopen($this->file, 'r');
+                $this->handle = fopen($this->file, 'r+') ?: fopen($this->file, 'r');
             }
         }
         restore_error_handler();