Tweeked win64 options so as not to conflict with 32bit builds.
Win64 builds now with NO_LIBRARIES added. Yes, you need to provide 64bit libraries yourself if you want to use them (dinput/dsound should be part of the directx sdk and are, strictly speaking, not re-distributable). See bothdefs.h for how to activate individual 64bit libs.
git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@3138 fc73d0e0-1445-4013-8a0c-d673dee63da5
