[3.14] GH-134291: Support older macOS deployment targets for JIT builds (GH-137211) #137701
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This rolls back GH-126196 and adds stricter checks for newer APIs in JIT CI. We don't really need the superpowers of the newer API (rapid flip-flopping permissions on JIT pages) since our JIT doesn't use self-modifying code.
This allows downstream distributors (like
uv
, CC @zanieb) to ship the JIT for more users.