nanoarrow: add IPC feature

[paleolimbot]

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• I did not use AI/LLM to create this PR, or I disclosed the tool/model below and reviewed its output; I did not attribute commits to AI and will answer maintainer questions and review comments myself without AI/LLM.

Copilot via Claude Opus 4.5 helped me with the additions. I'm happy to answer questions about this (I'm a nanoarrow maintainer).

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[SMillerDev]

Suggested change

	args << "-DNANOARROW_FLATCC_ROOT_DIR=#{Formula["flatcc"].opt_prefix}"
	args << "-DNANOARROW_FLATCC_ROOT_DIR=#{formula_opt_prefix("flatcc")}"