Change the vs2012 project files to use the v110_xp platform toolset, and the vs2013 project files to use the v120_xp platform toolset, so that the resulting executables can be run in Windows XP/2003.

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@5822 96395faa-99c1-11dd-bbfe-3dabce05a288