Add CPython 3.6.3rc1

plugins/python-build/share/python-build/3.6.3rc1

@@ -0,0 +1,8 @@
+#require_gcc
+install_package "openssl-1.0.2k" "https://www.openssl.org/source/openssl-1.0.2k.tar.gz#6b3977c61f2aedf0f96367dcfb5c6e578cf37e7b8d913b4ecb6643c3cb88d8c0" mac_openssl --if has_broken_mac_openssl
+install_package "readline-6.3" "https://ftpmirror.gnu.org/readline/readline-6.3.tar.gz#56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43" standard --if has_broken_mac_readline
+if has_tar_xz_support; then
+  install_package "Python-3.6.3rc1" "https://www.python.org/ftp/python/3.6.3/Python-3.6.3rc1.tar.xz#536e86ad0d0711434100bfe4f34f085814e6b75fba4d80e78c1e7d7f7f621c16" ldflags_dirs standard verify_py36 ensurepip
+else
+  install_package "Python-3.6.3rc1" "https://www.python.org/ftp/python/3.6.3/Python-3.6.3rc1.tgz#08fef77c535338fd73f05f1b83bfe9b6c731edf4c012f900a3836761bc77fd0c" ldflags_dirs standard verify_py36 ensurepip
+fi