Add CPython 3.9.7

plugins/python-build/share/python-build/3.9.7

@@ -0,0 +1,10 @@
+#require_gcc
+prefer_openssl11
+export PYTHON_BUILD_CONFIGURE_WITH_OPENSSL=1
+install_package "openssl-1.1.1k" "https://www.openssl.org/source/openssl-1.1.1k.tar.gz#892a0875b9872acd04a9fde79b1f943075d5ea162415de3047c327df33fbaee5" mac_openssl --if has_broken_mac_openssl
+install_package "readline-8.1" "https://ftpmirror.gnu.org/readline/readline-8.1.tar.gz#f8ceb4ee131e3232226a17f51b164afc46cd0b9e6cef344be87c65962cb82b02" mac_readline --if has_broken_mac_readline
+if has_tar_xz_support; then
+  install_package "Python-3.9.7" "https://www.python.org/ftp/python/3.9.7/Python-3.9.7.tar.xz#f8145616e68c00041d1a6399b76387390388f8359581abc24432bb969b5e3c57" standard verify_py39 copy_python_gdb ensurepip
+else
+  install_package "Python-3.9.7" "https://www.python.org/ftp/python/3.9.7/Python-3.9.7.tgz#a838d3f9360d157040142b715db34f0218e535333696a5569dc6f854604eb9d1" standard verify_py39 copy_python_gdb ensurepip
+fi