hgweb: make sure sys module is loaded prior to reload hack stable

hgweb: make sure sys module is loaded prior to reload hack

If sys is still a demandmod, reload(sys) fails with "TypeError: reload()
argument must be module".

--- a/mercurial/hgweb/server.py	Sat Feb 15 16:19:19 2014 +0900
+++ b/mercurial/hgweb/server.py	Wed Feb 19 21:16:43 2014 +0900
@@ -331,6 +331,7 @@
         # as ascii (clown fail), because the default Python Unicode
         # codec is hardcoded as ascii.
 
+        sys.argv # unwrap demand-loader so that reload() works
         reload(sys) # resurrect sys.setdefaultencoding()
         oldenc = sys.getdefaultencoding()
         sys.setdefaultencoding("latin1") # or any full 8-bit encoding