Add terminate call for crash handler for windows. Also add inactive code
to do backtrace flushing. This code will need DbgHelp.lib which we may
want to only include for debug builds if at all.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53772 954f8c5b-7b00-dc11-b283-0030488c597c