Fixes up config options for FFTW 3.3.8-impi
Fixes up config options for FFTW 3.3.8-impi

UCL-RITS/rcps-buildscripts,UCL-RITS/rcps-buildscripts,UCL-RITS/rcps-buildscripts,UCL-RITS/rcps-buildscripts,UCL-RITS/rcps-buildscripts