Fix broken file uploads with php version < 5.4

Author: Kraev Alexander

src/Jira/Api/Client/CurlClient.php

@@ -71,7 +71,9 @@ public function sendRequest($method, $url, $data = array(), $endpoint, Authentic
         curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
         curl_setopt($curl, CURLOPT_VERBOSE, $debug);
         if ($isFile) {
-            curl_setopt($curl, CURLOPT_SAFE_UPLOAD, false);
+            if (defined('CURLOPT_SAFE_UPLOAD')) {
+                curl_setopt($curl, CURLOPT_SAFE_UPLOAD, false);
+            }
             curl_setopt($curl, CURLOPT_HTTPHEADER, array('X-Atlassian-Token: nocheck'));
         } else {
             curl_setopt($curl, CURLOPT_HTTPHEADER, array("Content-Type: application/json;charset=UTF-8"));