CLN: compat.bind_method and core.common.bind_method
I'd like to remove `bind_method` from [here](https://github.com/pydata/pandas/blob/master/pandas/compat/__init__.py#L149-171) and [here](https://github.com/pydata/pandas/blob/master/pandas/core/common.py#L116-138), as I don't see any benefit over `setattr(cls, name, func)`.  Is there any?
