Correct some remnants of nonfunctional `extend`/`delete` syntax #91427

Job	Run time
matrix-variables	1s
skip-duplicates-code	5s
skip-duplicates-data	4s
Basic Build and Test (Clang 10, Ubuntu, Curses)	39m 34s
Clang 14, macOS 12, Tiles, Sound, x64 and arm64 Universal Binary	1h 15m 17s
GCC 9, Curses, LTO	56m 55s
Clang 12, Ubuntu, Tiles, ASan	2h 12m 52s
GCC 11, Ubuntu, Curses, ASan	2h 21m 5s
GCC 12, Ubuntu cross-compile to MinGW-Win64, Tiles, Sound	1s
GCC 9, Ubuntu, Tiles, Sound, CMake	1s
emscripten	0s
	7h 25m 55s

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