gh-114099: Modify preprocessor symbol usage to support older macOS SDKs #118073
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Older macOS SDKs don't expose the
TARGET_OS_*symbols; this PR makes the preprocessor usage compatible with those older SDKs.As discussed on PR #117887, this consolidates the two separate PRs (#117887 and #117892, both submitted by @jmroot) with an additional change to
Python/marshal.c, and tags the fix against the iOS feature that introduced the issue.Fixes #117891
Fixes #117886