Fix compiling of readthedocs after switch to ciecplib
This fixes the failing readthedocs builds: https://readthedocs.org/projects/gwcelery/builds/20096510/
These failures appeared after the commit: ce15c3a3
This fixes the failing readthedocs builds: https://readthedocs.org/projects/gwcelery/builds/20096510/
These failures appeared after the commit: ce15c3a3