[3.9] bpo-42692: fix __builtin_available check on older compilers (GH-23873) #24090
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A compiler that doesn't define
__has_builtin
will error out when it isused on the same line as the check for it.
Automerge-Triggered-By: GH:ronaldoussoren
(cherry picked from commit df21f50)
Co-authored-by: Joshua Root [email protected]
https://bugs.python.org/issue42692