[PyQt] Missing const cast when using PyObject_CallMethod for Python 2

[Ilya Kulakov]

Second parameter must be casted, otherwise clang reports an error.
Here is the patch:
https://github.com/GreatFruitAndy/pyqtdeploy/commit/c6975e9dfbb905fd8a5dc6414fe0b47571fc803a.patch <https://github.com/GreatFruitAndy/pyqtdeploy/commit/c6975e9dfbb905fd8a5dc6414fe0b47571fc803a.patch>

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