Cleanup CMake configuration
This is part of a bigger MR I'm working on now, but I realised that the issues I thought were related to this commit were actually caused by something else, so I could cherry-pick this out (which will - hopefully - make @akraszna happy! ;-) )
This is a purely technical change and will have no effect on output.
I also compiled all clients (see below) of this package to make sure that they were not affected either.
+ Tracking/Acts/ActsTrkAlgs/ActsTrkAnalysis
+ Tracking/Acts/ActsTrkAlgs/ActsTrkFinding
+ Tracking/Acts/ActsTrkAlgs/ActsTrkFittingAlgs
+ Tracking/Acts/ActsTrkAlgs/ActsTrkSeeding
+ Tracking/Acts/ActsTrkTools/ActsTrkFindingTool
+ Tracking/Acts/ActsTrkTools/ActsTrkFittingTools