Replace u/npc_has_var with compare_string #94864

Job	Run time
matrix-variables	1s
skip-duplicates-code	5s
skip-duplicates-data	7s
Basic Build and Test (Clang 10, Ubuntu, Curses)	57m 2s
Clang 14, macOS 12, Tiles, Sound, x64 and arm64 Universal Binary	1h 31m 25s
GCC 9, Curses, LTO	56m 55s
Clang 12, Ubuntu, Tiles, ASan	1h 23m 50s
GCC 11, Ubuntu, Curses, ASan	2h 32m 35s
GCC 12, Ubuntu cross-compile to MinGW-Win64, Tiles, Sound	1h 8m 7s
GCC 9, Ubuntu, Tiles, Sound, CMake	20m 15s
emscripten / Build	1h 55m 46s
	10h 46m 8s

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