2.6.0: Use sorted(glob()) in example setup.py

[jbarlow83]

I suggest changing the example setup.py as follows below, to use a sorted glob instead of naming one source file.

This strategy eliminates errors from forgetting to enumerate source files one by one when a new .cpp is added. Using sorted(glob()) also ensures the build will be reproducible on file systems that do not enumerate files in sorted order (most Linux filesystems).

I also added a missing code-block directive.

[henryiii]

I think this looks like a good idea. Was trying to keep simple, but this doesn't add too much, and keeps the sorted detail present.