Force the content-length header to be a string in httprepo.unbundle.

(Needed for Python2.3 compatibility)

mercurial/httprepo.py

@@ -339,7 +339,7 b' class httprepository(remoterepository):'
             try:
                 rfp = self.do_cmd(
                     'unbundle', data=fp,
-                    headers={'content-length': length,
+                    headers={'content-length': str(length),
                              'content-type': 'application/octet-stream'},
                     heads=' '.join(map(hex, heads)))
                 try: