macOS

Remove unused RBASIC_RESET_FLAGS #638

Job	Run time
make (check, macos-14, --with-gmp)	6m 55s
make (check, macos-14, --with-gcc=gcc-14)	9m 21s
make (test-bundled-gems, macos-14)	10m 54s
make (check, macos-15)	5m 39s
make (test-bundler-parallel, macos-14)	26m 26s
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	7m 14s
make (check, macos-13)	9m 51s
make (test-all, --repeat-count=2, macos-14)	10m 58s
make (check, macos-14)	7m 17s
macOS result	2s
	1h 34m 37s

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