[issue2746] ElementTree ProcessingInstruction uses character entities in content

[Simon Cross]

Simon Cross <hodgestar at gmail.com> added the comment:

cElementTree.ElementTree is a copy of ElementTree.ElementTree with the
.parse(...) method replaced, so the original patch for ElementTree
should fix cElementTree too.

The copying of the ElementTree class into cElementTree happens in the
call to boostrap in the init_elementtree() function at the bottom of
_elementtree.c.

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nosy: +hodgestar

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