Don't use sys.debug, it gets preprocessed out

Problem introduced in b29f78772e

lib/http.js

@@ -1,3 +1,12 @@
+var debugLevel = 0;
+if ("NODE_DEBUG" in process.env) debugLevel = 1;
+
+function debug (x) {
+  if (debugLevel > 0) {
+    process.binding('stdio').writeError(x + "\n");
+  }
+}
+
 var sys = require('sys');
 var net = require('net');
 var events = require('events');
@@ -534,7 +543,7 @@ function Client ( ) {
 
   self._reconnect = function () {
     if (self.readyState != "opening") {
-      sys.debug("HTTP CLIENT: reconnecting readyState = " + self.readyState);
+      debug("HTTP CLIENT: reconnecting readyState = " + self.readyState);
       self.connect(self.port, self.host);
     }
   };
@@ -542,12 +551,12 @@ function Client ( ) {
   self._pushRequest = function (req) {
     req.addListener("flush", function () {
       if (self.readyState == "closed") {
-        sys.debug("HTTP CLIENT request flush. reconnect.  readyState = " + self.readyState);
+        debug("HTTP CLIENT request flush. reconnect.  readyState = " + self.readyState);
         self._reconnect();
         return;
       }
 
-      sys.debug("self flush  readyState = " + self.readyState);
+      debug("self flush  readyState = " + self.readyState);
       if (req == currentRequest) flushMessageQueue(self, [req]);
     });
     requests.push(req);
@@ -568,7 +577,7 @@ function Client ( ) {
     parser.finish();
     freeParser(parser);
 
-    //sys.debug("self got end closing. readyState = " + self.readyState);
+    debug("self got end closing. readyState = " + self.readyState);
     self.close();
   });
 
@@ -578,7 +587,7 @@ function Client ( ) {
       return;
     }
 
-    sys.debug("HTTP CLIENT onClose. readyState = " + self.readyState);
+    debug("HTTP CLIENT onClose. readyState = " + self.readyState);
 
     // If there are more requests to handle, reconnect.
     if (requests.length > 0) {
@@ -587,10 +596,10 @@ function Client ( ) {
   });
 
   parser.onIncoming = function (res) {
-    sys.debug("incoming response!");
+    debug("incoming response!");
 
     res.addListener('end', function ( ) {
-      //sys.debug("request complete disconnecting. readyState = " + self.readyState);
+      debug("request complete disconnecting. readyState = " + self.readyState);
       self.close();
     });