[issue29456] bugs in unicodedata.normalize: u1176, u11a7 and u11c3

[Xiang Zhang]

Xiang Zhang <angwerzx at 126.com> added the comment:

Sorry for the absence and late response. I just reviewed it and think it's ready. I think the change in the unicode standard is more like a bug in the implementation than an intentional change. It's mentioned in Unicode 3.0 the third character is out of bounds when TIndex <= 0 or TIndex >= TCount. We have a ucd_3_2_0 in unicodedata.

I'll merge it after resolve the CI bot.

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versions: +Python 3.8 -Python 3.5

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