Remove CPython 2.7.12rc1 in favor of 2.7.12

plugins/python-build/share/python-build/2.7.12rc1

@@ -1,4 +0,0 @@
-#require_gcc
-install_package "openssl-1.0.2g" "https://www.openssl.org/source/openssl-1.0.2g.tar.gz#b784b1b3907ce39abf4098702dade6365522a253ad1552e267a9a0e89594aa33" mac_openssl --if has_broken_mac_openssl
-install_package "readline-6.3" "http://ftpmirror.gnu.org/readline/readline-6.3.tar.gz#56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43" standard --if has_broken_mac_readline
-install_package "Python-2.7.12rc1" "https://www.python.org/ftp/python/2.7.12/Python-2.7.12rc1.tgz#83f5cdbbb3494753d0e1ed2a093942c1ddcd04264af5e7d6183c7f7c64ffd33c" ldflags_dirs standard verify_py27 ensurepip