[issue19405] Fix outdated comments in the _sre module

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

In 2.7 SRE_CODE is 32-bit too (since issue1160). Only last chunk in Lib/sre_compile.py patch shouldn't apply to 2.7.

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<http://bugs.python.org/issue19405>
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