[RF] Make RooBatchCompute dependency public.

RooFitCore + its dependencies use headers from RooBatchCompute. The
dependency was private before, but now that include directories are
not anymore cheated into every target, the dependency had to be made
public.

roofit/roofitcore/CMakeLists.txt

@@ -476,9 +476,9 @@ ROOT_STANDARD_LIBRARY_PACKAGE(RooFitCore
   DICTIONARY_OPTIONS
     "-writeEmptyRootPCM"
   LIBRARIES
-    RooBatchCompute
     RooFitCommon
   DEPENDENCIES
+    RooBatchCompute
     Core
     Hist
     Graf