[issue1772673] Replacing char* with const char*

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

Douglas Greiman submitted many similar changes with his issue2135 patch.  
His patch also amends documentation, which is missing here.

I am adding dgreiman to the nosy list here to avoid duplication of 
effort.

I am -0 on the idea.

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nosy: +belopolsky, dgreiman

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<http://bugs.python.org/issue1772673>
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