Add Python 2.7.15rc1.

plugins/python-build/share/python-build/2.7.15rc1

@@ -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-2.7.15rc1" "https://www.python.org/ftp/python/2.7.15/Python-2.7.15rc1.tar.xz#d022fe643281d0f83a29dfd254d9c66d066bce0e2d57452d256b0886530227ec" ldflags_dirs standard verify_py27 ensurepip
+else
+  install_package "Python-2.7.15rc1" "https://www.python.org/ftp/python/2.7.15/Python-2.7.15rc1.tgz#8a0c4ce73d351d73dc105cb8dadd2b5b0aa91956353a558dff10962f543f5d8b" ldflags_dirs standard verify_py27 ensurepip
+fi