Don't trim whitespace from sections of the response in IXR_Client. Fixes #12559 props apeatling.

git-svn-id: http://svn.automattic.com/wordpress/trunk@14677 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-IXR.php

@@ -581,7 +581,8 @@ class IXR_Client {
                 $gettingHeaders = false;
             }
             if (!$gettingHeaders) {
-                $contents .= trim($line);
+            	// WP#12559 remove trim so as to not strip newlines from received response.
+                $contents .= $line;
             }
             if ($this->debug) {
                 $debug_contents .= $line;