Applied workaround from: http://scons.tigris.org/issues/show_bug.cgi?id=2449
NOTE: Both python and SCons are NOT planning to fix this, so we will need this
fix even when upgrading to newer versions of scons or python.
+
+Added Visual Studio 2013 support (by registry detection only) to
+engine/SCons/Tools/MSCommon/vc.py