The `ictce` toolchain includes `IntelFFTW`, but it's possible to also provide an `ictce` toolchain that doesn't provide the FFTW interfaces (i.e., when imkl was built without explicitly asking for the FFTW interfaces)...

That's what this whole pull request is about.

So, should we then rename ictce toolchain verisons (e.g. ,`3.2.2.u3`) to `ictce-no-fftw` (OK, a little bit verbose, but you get the point).