JetRecTools: cmake fix

Root math library is called MathCore, not Math.

This merge request affects 1 file:

• Reconstruction/Jet/JetRecTools/CMakeLists.txt

Adding @goetz ,@mleblanc as watchers

added JetEtmiss Reconstruction master review-pending-level-1 labels

CI Result SUCCESS (hash eeb57e28)

	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 23382]

mentioned in commit 027a4ca5

merged

added sweep:ignore label