keyword: monkeypatch patch.diff more generically

This function doesn't need access to any of the args or kwargs, so make the
monkeypatching more robust. (In upcoming patches we'll introduce another
argument to patch.diff, and this function would break if it weren't for this
patch.)

hgext/keyword.py

@@ -643,11 +643,10 b' def reposetup(ui, repo):'
         # shrink keywords read from working dir
         self.lines = kwt.shrinklines(self.fname, self.lines)
 
-    def kwdiff(orig, repo, node1=None, node2=None, match=None, changes=None,
-                opts=None, prefix=''):
+    def kwdiff(orig, *args, **kwargs):
         '''Monkeypatch patch.diff to avoid expansion.'''
         kwt.restrict = True
-        return orig(repo, node1, node2, match, changes, opts, prefix)
+        return orig(*args, **kwargs)
 
     def kwweb_skip(orig, web, req, tmpl):
         '''Wraps webcommands.x turning off keyword expansion.'''