Fix compiler warnings from extensions

Toblerity / Fiona

Fiona reads and writes geographic data files

https://fiona.readthedocs.io/

BSD 3-Clause "New" or "Revised" License

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Closed QuLogic closed 9 months ago

QuLogic commented 9 months ago

The fixes 3 sets of warnings:

An unused __hash__ function, caused by a duplicated definition on the Cython side.
Various const char* -> char* warnings.
A maybe-uninitialized variable warning.

See commit message for details.

sgillies commented 9 months ago

@sgillies note to port to maint-1.9.