Get shared object suffix from EXT_SUFFIX

[sirno]

Hey,

I ran into an issue installing pysam with python 3.11.0. It seems that the SO configuration has been deprecated and EXT_SUFFIX should be used instead.

Also note that using get_config_var to access would have likely triggered a deprecation warning :)

Lets see what the actions say, but in case this causes test failures for older versions, I can adjust this to make it conditional.

Cheers

[mvdbeek]

That works for me, on 3.11 and 3.6, so I guess the tests would pass.

[jayaddison]

I think this would also resolve #1154.

@sirno could you check the rest of the codebase for references to the SO config var?

[jmarshall]

Thanks, I've merged this and updated it to use both EXT_SUFFIX and SO everywhere. (According to pysam/NEWS we still support back to Python 3.2. Some early 3.2.x and 3.3.x versions do not define EXT_SUFFIX, so for now we still need to consult both config variables.)