Fix force build for CTK
Fix force build for CTK

Replace the 'build depends on always run step' rule for CTK (which does
not work with at least Ninja) with a rule to remove the stamp for the
build step. This more reliably ensures that the build step for CTK is
always executed.

Sardge/CTK,jcfr/CTK,Sardge/CTK,AndreasFetzer/CTK,fedorov/CTK,jcfr/CTK,sankhesh/CTK,commontk/CTK,rkhlebnikov/CTK,pieper/CTK,pieper/CTK,CJGoch/CTK,commontk/CTK,rkhlebnikov/CTK,SINTEFMedtek/CTK,pieper/CTK,jcfr/CTK,CJGoch/CTK,151706061/CTK,ddao/CTK,danielknorr/CTK,AndreasFetzer/CTK,AndreasFetzer/CTK,151706061/CTK,msmolens/CTK,danielknorr/CTK,SINTEFMedtek/CTK,pieper/CTK,SINTEFMedtek/CTK,msmolens/CTK,sankhesh/CTK,laurennlam/CTK,CJGoch/CTK,mehrtash/CTK,naucoin/CTK,commontk/CTK,danielknorr/CTK,Sardge/CTK,mehrtash/CTK,msmolens/CTK,rkhlebnikov/CTK,fedorov/CTK,fedorov/CTK,fedorov/CTK,ddao/CTK,jcfr/CTK,danielknorr/CTK,laurennlam/CTK,sankhesh/CTK,Heather/CTK,mehrtash/CTK,msmolens/CTK,naucoin/CTK,SINTEFMedtek/CTK,laurennlam/CTK,naucoin/CTK,commontk/CTK,naucoin/CTK,151706061/CTK,Heather/CTK,Heather/CTK,rkhlebnikov/CTK,Heather/CTK,ddao/CTK,151706061/CTK,Sardge/CTK,CJGoch/CTK,CJGoch/CTK,151706061/CTK,laurennlam/CTK,SINTEFMedtek/CTK,jcfr/CTK,ddao/CTK,mehrtash/CTK,sankhesh/CTK,AndreasFetzer/CTK