wrapcommand: use functools.partial

Like the previous patch, this helps remove noises in traceback.

Practically, this removes another 6 lines in `rebase -s . -d .` traceback in
my setup:

   ....
   File "hg/mercurial/util.py", line 1118, in check
     return func(*args, **kwargs)
  -File "hg/mercurial/extensions.py", line 331, in closure
  -  return func(*(args + a), **kw)
   File "hg/mercurial/util.py", line 1118, in check
     return func(*args, **kwargs)
   File "fb-hgext/hgext3rd/fbhistedit.py", line 283, in _rebase
     return orig(ui, repo, **opts)
   File "hg/mercurial/util.py", line 1118, in check
     return func(*args, **kwargs)
  -File "hg/mercurial/extensions.py", line 331, in closure
  -  return func(*(args + a), **kw)
   File "hg/mercurial/util.py", line 1118, in check
     return func(*args, **kwargs)
   File "remotenames.py", line 633, in exrebasecmd
     ret = orig(ui, repo, **opts)
   File "hg/mercurial/util.py", line 1118, in check
     return func(*args, **kwargs)
  -File "hg/mercurial/extensions.py", line 331, in closure
  -  return func(*(args + a), **kw)
   File "hg/mercurial/util.py", line 1118, in check
     return func(*args, **kwargs)
   File "fb-hgext/hgext3rd/fbamend/__init__.py", line 453, in wraprebase
     return orig(ui, repo, **opts)
   File "hg/mercurial/util.py", line 1118, in check
     return func(*args, **kwargs)
   ....

Differential Revision: https://phab.mercurial-scm.org/D633

mercurial/extensions.py

@@ -377,7 +377,8 b' def wrapcommand(table, command, wrapper,'
             break
 
     origfn = entry[0]
-    wrap = bind(util.checksignature(wrapper), util.checksignature(origfn))
+    wrap = functools.partial(util.checksignature(wrapper),
+                             util.checksignature(origfn))
     _updatewrapper(wrap, origfn, wrapper)
     if docstring is not None:
         wrap.__doc__ += docstring