Define _XOPEN_SOURCE_EXTENDED on mac localized curses builds for wchar #88585

Job	Run time
skip-duplicates-code	5s
skip-duplicates-data	8s
matrix-variables	1s
Basic Build and Test (Clang 10, Ubuntu, Curses)	37m 35s
Clang 14, macOS 12, Tiles, Sound, x64 and arm64 Universal Binary	1h 18m 7s
GCC 9, Curses, LTO	2h 42m 18s
Clang 12, Ubuntu, Tiles, ASan	1s
GCC 11, Ubuntu, Curses, ASan	1s
GCC 12, Ubuntu cross-compile to MinGW-Win64, Tiles, Sound	1s
GCC 9, Ubuntu, Tiles, Sound, CMake	1s
emscripten	1s
	4h 38m 19s

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