Add CPython 3.8.6 (#1698)

plugins/python-build/share/python-build/3.8.6

@@ -0,0 +1,10 @@
+#require_gcc
+prefer_openssl11
+export PYTHON_BUILD_CONFIGURE_WITH_OPENSSL=1
+install_package "openssl-1.1.0j" "https://www.openssl.org/source/old/1.1.0/openssl-1.1.0j.tar.gz#31bec6c203ce1a8e93d5994f4ed304c63ccf07676118b6634edded12ad1b3246" mac_openssl --if has_broken_mac_openssl
+install_package "readline-8.0" "https://ftpmirror.gnu.org/readline/readline-8.0.tar.gz#e339f51971478d369f8a053a330a190781acb9864cf4c541060f12078948e461" mac_readline --if has_broken_mac_readline
+if has_tar_xz_support; then
+  install_package "Python-3.8.6" "https://www.python.org/ftp/python/3.8.6/Python-3.8.6.tar.xz#a9e0b79d27aa056eb9cce8d63a427b5f9bab1465dee3f942dcfdb25a82f4ab8a" ldflags_dirs standard verify_py38 copy_python_gdb ensurepip
+else
+  install_package "Python-3.8.6" "https://www.python.org/ftp/python/3.8.6/Python-3.8.6.tgz#313562ee9986dc369cd678011bdfd9800ef62fbf7b1496228a18f86b36428c21" ldflags_dirs standard verify_py38 copy_python_gdb ensurepip
+fi