Add Python 2.7.4 and Fix `No module named _sqlite3` for 2.7.4

1. Add Python 2.7.4 to config.cfg
2. Fix `No module named _sqlite3` for 2.7.4

issue17857: http://bugs.python.org/issue17857

Verified working with Python 2.7.3 under pythonbrew on Red Hat Enterprise Linux Server release 5.7 (Tikanga)