Fixed GET_CMGUI_SYSTEM_NAME in cmake script to pass in a correct Redhat system string that can be recognised by the compiler. https://tracker.physiomeproject.org/show_bug.cgi?id=3260
Fixed GET_CMGUI_SYSTEM_NAME in cmake script to pass in a correct Redhat system string that can be recognised by the compiler. https://tracker.physiomeproject.org/show_bug.cgi?id=3260

cmiss/cmgui,cmiss/cmgui