Add CPython 3.4.0rc3

plugins/python-build/share/python-build/3.4.0rc3

@@ -0,0 +1,3 @@
+require_cc "gcc" "clang"
+install_package "readline-6.2" "http://ftpmirror.gnu.org/readline/readline-6.2.tar.gz#67948acb2ca081f23359d0256e9a271c" standard --if has_broken_mac_readline
+install_package "Python-3.4.0rc3" "http://python.org/ftp/python/3.4.0/Python-3.4.0rc3.tgz#15f30d9d906eea3c5f2b1893769a20ca" ldflags_dirs standard verify_py34 ensurepip