[issue3931] codecs.charmap_build is untested and undocumented

[Mark Lawrence]

Mark Lawrence added the comment:

I do not see much purpose in documenting and testing this one function alone.  I think that all functions in _codecsmodule.c should be looked at to see if they are private or public, but I'm certainly not volunteering to do it.

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<http://bugs.python.org/issue3931>
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