obs-scripting: Fix macro redefinition warning

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In Python 3.9+, `PyCFunction_New` and `PyCFunction_NewEx` are themselves
macros around `PyMethod_New`. To fix the warning, both macros need to
be untouched for those Python versions, instead the actual function
`PyMethod_New` needs to be imported and aliased.

This commit:

- Adds the import of the `PyCMethod_New` symbol
- Adds the function definition for `Import_PyCMethod_New`
- Adds the `PyCMethod_New` function alias

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