Update CMakeList of G4RichTbSimHTest to ignore warnings from CLHEP and ROOT

LHCbG4Tests/G4RichTbSimHTest/CMakeLists.txt

@@ -6,7 +6,7 @@ find_package(CLHEP REQUIRED COMPONENTS Random)
 find_package(ROOT REQUIRED COMPONENTS Hist Tree RIO)
 find_package(TBB)
 
-include_directories(${CMAKE_INSTALL_PREFIX}/include)
+include_directories(SYSTEM ${CMAKE_INSTALL_PREFIX}/include ${CLHEP_INCLUDE_DIRS} ${ROOT_INCLUDE_DIRS})
 link_directories(${CMAKE_INSTALL_PREFIX}/lib)
 
 set(Geant4_LIBRARIES
@@ -39,7 +39,4 @@ gaudi_add_executable(G4RichTbSimHTest
 
 add_dependencies(G4RichTbSimHTest Geant4)
 
-# Dirty fix to disable the pesky warning
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-suggest-override")
-
 gaudi_install_scripts()