Added module prereqs for building amber and note it uses -xHost
Added module prereqs for building amber and note it uses -xHost

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