macOS

Add rbs support to tool/rdoc-srcdir for make html #10455

Job	Run time
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	8m 25s
make (test-all, --repeat-count=2, macos-14)	8m 41s
make (check, macos-14, --with-gmp)	6m 54s
make (check, macos-14, --with-gcc=gcc-14)	7m 50s
make (test-bundler-parallel, macos-14)	15m 12s
make (check, macos-14)	8m 54s
make (check, macos-15)	7m 59s
make (test-bundled-gems, macos-14)	6m 47s
macOS result	3s
	1h 10m 45s

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