keep-alive over http proxy

In commit log of http.c rev1.153:
> Don't use persistent connection over proxies.
but actual code is commented out. Because of this wget-1.10 does not
handle persistent connection over proxy very well; it hangs 60 seconds
between each retrieval.

$ export http_proxy=localhost:3128
$ /usr/bin/time ./src/wget -q www.apache.org
       60.48 real         0.01 user         0.00 sys
$ /usr/bin/time ./src/wget -q --no-http-keep-alive www.apache.org
        0.01 real         0.00 user         0.01 sys
$ /usr/bin/time ./src/wget -q --proxy=off www.apache.org
        1.38 real         0.00 user         0.01 sys

fix:
uncomment proxy like below.

Index: src/http.c
===================================================================
RCS file: /pack/anoncvs/wget/src/http.c,v
retrieving revision 1.158
diff -u -r1.158 http.c
--- src/http.c	2005/04/14 21:12:57	1.158
+++ src/http.c	2005/04/16 01:24:14
@@ -1126,7 +1126,7 @@
      causing it to not close the connection and leave both the proxy
      and the client hanging.  */
   int inhibit_keep_alive =
-    !opt.http_keep_alive || opt.ignore_length /*|| proxy != NULL*/;
+    !opt.http_keep_alive || opt.ignore_length || proxy != NULL;
 
   /* Headers sent when using POST. */
   wgint post_data_size = 0;