[3.14] gh-145219: Add Emscripten cross-build and clean configurability (GH-145581)#145654

freakboy3742 merged 1 commit intopython:3.14python/cpython:3.14from

miss-islington:backport-0156133-3.14miss-islington/cpython:backport-0156133-3.14Copy head branch name to clipboard