gnulib-tool.py: Remove some unused variables.

[Collin Funk]

There are a few cases of statements like this:

      var = None
      try:
          # do something
          var = True
       except:
          var = False
or:

     var = None
     if other_condition:
         var = True
     else:
         var = False

Since the 'var' will be set to a bool unconditionally, the None is
never used.

Collin

0001-gnulib-tool.py-Remove-some-unused-variables.patch
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