Actually does what bab8079 promised: passes the jXHR as the third arg…

…ument of prefilters and transport factories. Comitted for completness even if if backs this out in the end and only land in 1.5.1.

src/ajax.js

@@ -88,7 +88,7 @@ function inspectPrefiltersOrTransports( structure, options, originalOptions, jXH
 		selection;
 
 	for(; i < length && ( executeOnly || !selection ); i++ ) {
-		selection = list[ i ]( options, originalOptions );
+		selection = list[ i ]( options, originalOptions, jXHR );
 		// If we got redirected to another dataType
 		// we try there if not done already
 		if ( typeof selection === "string" ) {