RootUtils: cmake fix for clang compilation

Only the RootUtilsPyROOT library should depend on the pyroot libraries (ROOTTPython and cppyy). In particular, the RootUtils library should not depend on these libraries.

Things were failing in the clang build because RootUtils was linking against cppyy but not against python, so things downstream were failing to find python symbols.

(In principle this is wrong for the gcc build as well; not entirely sure why it was working there.)

This merge request affects 1 file:

• Control/RootUtils/CMakeLists.txt

Adding @ssnyder as watcher

added Core master review-pending-level-1 labels

CI Result SUCCESS (hash d74a04c6)

	Athena	AthSimulation	AthGeneration	AnalysisBase
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 23266]

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 5df60e83

added sweep:ignore label