Remove dependencies from basic release build

Managed to get the basic "release" build working again, this lets codeblocks compile Cata without gettext or SDL.  This shouldn't have any effect on any of the other build options, but as I have no way to test them I can't be sure, so I'd appreciate it if someone else could give this a quick once-over, as I'd rather not introduce a major screw-up into what is essentially the core of the build (at least if you use codeblocks).  It does seem to work fine on my end however.