add dependency to tree lib

tree/tree/CMakeLists.txt

@@ -119,6 +119,7 @@ ROOT_STANDARD_LIBRARY_PACKAGE(Tree
     Imt
     Net
     RIO
+    MathCore
   LIBRARIES
     ${ROOT_ATOMIC_LIBS}
 )

tree/treeplayer/src/TTreeTableInterface.cxx

@@ -11,7 +11,6 @@
 #include "TClass.h"
 #include "Riostream.h"
 #include "TSystem.h"
-#include "TGResourcePool.h"
 #include "TTreeTableInterface.h"
 #include "TTreeFormula.h"
 #include "TError.h"