Define _XOPEN_SOURCE_EXTENDED on mac localized curses builds for wchar #73697
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Summary
None
Purpose of change
The macOS release build is broken as can be seen in https://github.com/CleverRaven/Cataclysm-DDA/actions/runs/9046935560/job/24858676569#step:27:370
This happened in #73414 and again we didn't catch it because we don't have a macOS/curses build in the test suite.
Describe the solution
I stumbled across this incantation that might soothe the foul beast.
Describe alternatives you've considered
Tried to unpack wchar into utf8 strings in #73694 but I can't get that to work.
Testing
Can't test locally, it's up to the release osx curses build.