[3.9] bpo-42692: fix __builtin_available check on older compilers (GH-23873)#24090

ned-deily merged 1 commit into

python:3.9python/cpython:3.9from

miss-islington:backport-df21f50-3.9miss-islington/cpython:backport-df21f50-3.9Copy head branch name to clipboard