macOS

Add `rb_ec_close` function to manage execution context cleanup. (#15253) #700

Job	Run time
make (check, macos-14)	8m 37s
make (test-bundler-parallel, macos-14)	21m 40s
make (test-bundled-gems, macos-14)	11m 35s
make (check, macos-14, --with-gcc=gcc-14)	8m 55s
make (test-all, --repeat-count=2, macos-14)	9m 31s
make (check, macos-15)	8m 57s
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	6m 51s
make (check, macos-14, --with-gmp)	6m 13s
macOS result	3s
	1h 22m 22s

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