Add __ROOFIT_NOBANNER Definition to RooFitCore

This compiler flag — foreseen by the original authors — stops RooFit
from displaying its banner in front of the banner and license
information of the main application

roofit/roofitcore/CMakeLists.txt

@@ -471,4 +471,8 @@ foreach(incl ${fitcore_incl})
    target_include_directories(RooFitCore PUBLIC $<BUILD_INTERFACE:${incl}>)
 endforeach()
 
+# Modification for Fp311Online@Ruhr-Universität Bochum
+target_compile_definitions(RooFitCore PRIVATE __ROOFIT_NOBANNER)
+# End of modification
+
 ROOT_ADD_TEST_SUBDIRECTORY(test)