Second part of the fix for ROOT-6694
Second part of the fix for ROOT-6694

when building the checksum of a class, do not check base classes
if the class is in stl.

krafczyk/root,gbitzes/root,gbitzes/root,CristinaCristescu/root,mkret2/root,Y--/root,gbitzes/root,omazapa/root-old,jrtomps/root,perovic/root,bbockelm/root,simonpf/root,mhuwiler/rootauto,veprbl/root,sawenzel/root,omazapa/root,lgiommi/root,omazapa/root,sirinath/root,CristinaCristescu/root,buuck/root,simonpf/root,davidlt/root,mhuwiler/rootauto,CristinaCristescu/root,sirinath/root,abhinavmoudgil95/root,beniz/root,sawenzel/root,sbinet/cxx-root,gbitzes/root,evgeny-boger/root,Duraznos/root,perovic/root,arch1tect0r/root,CristinaCristescu/root,zzxuanyuan/root-compressor-dummy,georgtroska/root,davidlt/root,olifre/root,agarciamontoro/root,nilqed/root,esakellari/root,beniz/root,bbockelm/root,olifre/root,root-mirror/root,georgtroska/root,arch1tect0r/root,perovic/root,gganis/root,Duraznos/root,karies/root,dfunke/root,davidlt/root,vukasinmilosevic/root,thomaskeck/root,gbitzes/root,omazapa/root-old,perovic/root,davidlt/root,mhuwiler/rootauto,esakellari/my_root_for_test,agarciamontoro/root,mattkretz/root,sbinet/cxx-root,BerserkerTroll/root,zzxuanyuan/root-compressor-dummy,root-mirror/root,omazapa/root-old,zzxuanyuan/root,dfunke/root,mhuwiler/rootauto,root-mirror/root,thomaskeck/root,pspe/root,zzxuanyuan/root,evgeny-boger/root,beniz/root,dfunke/root,olifre/root,Y--/root,jrtomps/root,bbockelm/root,esakellari/my_root_for_test,Y--/root,satyarth934/root,mhuwiler/rootauto,sawenzel/root,krafczyk/root,satyarth934/root,CristinaCristescu/root,olifre/root,zzxuanyuan/root-compressor-dummy,nilqed/root,zzxuanyuan/root,satyarth934/root,bbockelm/root,vukasinmilosevic/root,veprbl/root,jrtomps/root,BerserkerTroll/root,root-mirror/root,Y--/root,mattkretz/root,gganis/root,pspe/root,veprbl/root,simonpf/root,bbockelm/root,buuck/root,simonpf/root,omazapa/root,sbinet/cxx-root,evgeny-boger/root,BerserkerTroll/root,jrtomps/root,satyarth934/root,sirinath/root,mkret2/root,davidlt/root,davidlt/root,agarciamontoro/root,esakellari/my_root_for_test,zzxuanyuan/root,Y--/root,dfunke/root,perovic/root,sbinet/cxx-root,agarciamontoro/root,buuck/root,zzxuanyuan/root,gganis/root,simonpf/root,pspe/root,dfunke/root,thomaskeck/root,agarciamontoro/root,simonpf/root,mattkretz/root,perovic/root,davidlt/root,nilqed/root,krafczyk/root,veprbl/root,root-mirror/root,simonpf/root,sbinet/cxx-root,georgtroska/root,thomaskeck/root,jrtomps/root,karies/root,root-mirror/root,Duraznos/root,agarciamontoro/root,abhinavmoudgil95/root,mhuwiler/rootauto,lgiommi/root,zzxuanyuan/root,lgiommi/root,BerserkerTroll/root,buuck/root,georgtroska/root,georgtroska/root,mattkretz/root,dfunke/root,vukasinmilosevic/root,gbitzes/root,lgiommi/root,veprbl/root,nilqed/root,mkret2/root,satyarth934/root,BerserkerTroll/root,beniz/root,mattkretz/root,omazapa/root-old,sirinath/root,evgeny-boger/root,omazapa/root,nilqed/root,sbinet/cxx-root,esakellari/my_root_for_test,davidlt/root,agarciamontoro/root,sawenzel/root,mhuwiler/rootauto,beniz/root,esakellari/my_root_for_test,Duraznos/root,evgeny-boger/root,sirinath/root,BerserkerTroll/root,arch1tect0r/root,omazapa/root-old,gganis/root,Duraznos/root,abhinavmoudgil95/root,satyarth934/root,bbockelm/root,perovic/root,Y--/root,jrtomps/root,mattkretz/root,omazapa/root-old,zzxuanyuan/root-compressor-dummy,jrtomps/root,agarciamontoro/root,davidlt/root,zzxuanyuan/root-compressor-dummy,abhinavmoudgil95/root,perovic/root,sirinath/root,pspe/root,omazapa/root-old,CristinaCristescu/root,buuck/root,dfunke/root,root-mirror/root,abhinavmoudgil95/root,mkret2/root,sawenzel/root,arch1tect0r/root,zzxuanyuan/root,evgeny-boger/root,esakellari/root,arch1tect0r/root,gganis/root,sbinet/cxx-root,karies/root,sirinath/root,mkret2/root,sirinath/root,Duraznos/root,arch1tect0r/root,mhuwiler/rootauto,karies/root,vukasinmilosevic/root,davidlt/root,perovic/root,esakellari/root,bbockelm/root,omazapa/root-old,veprbl/root,BerserkerTroll/root,Duraznos/root,olifre/root,davidlt/root,omazapa/root-old,mattkretz/root,sawenzel/root,omazapa/root,arch1tect0r/root,beniz/root,esakellari/my_root_for_test,esakellari/root,mattkretz/root,mhuwiler/rootauto,Duraznos/root,georgtroska/root,satyarth934/root,CristinaCristescu/root,abhinavmoudgil95/root,abhinavmoudgil95/root,omazapa/root-old,karies/root,sawenzel/root,olifre/root,esakellari/my_root_for_test,dfunke/root,evgeny-boger/root,georgtroska/root,thomaskeck/root,omazapa/root,arch1tect0r/root,gganis/root,buuck/root,perovic/root,sawenzel/root,mkret2/root,omazapa/root,Y--/root,karies/root,mhuwiler/rootauto,krafczyk/root,omazapa/root-old,omazapa/root,lgiommi/root,mkret2/root,simonpf/root,gbitzes/root,zzxuanyuan/root,Y--/root,jrtomps/root,root-mirror/root,dfunke/root,karies/root,simonpf/root,gganis/root,georgtroska/root,buuck/root,satyarth934/root,buuck/root,karies/root,krafczyk/root,beniz/root,bbockelm/root,esakellari/my_root_for_test,veprbl/root,zzxuanyuan/root-compressor-dummy,pspe/root,vukasinmilosevic/root,agarciamontoro/root,nilqed/root,olifre/root,arch1tect0r/root,thomaskeck/root,evgeny-boger/root,satyarth934/root,esakellari/root,zzxuanyuan/root-compressor-dummy,pspe/root,vukasinmilosevic/root,BerserkerTroll/root,gganis/root,thomaskeck/root,bbockelm/root,buuck/root,simonpf/root,nilqed/root,arch1tect0r/root,esakellari/my_root_for_test,krafczyk/root,esakellari/root,esakellari/root,nilqed/root,omazapa/root,esakellari/root,mattkretz/root,sbinet/cxx-root,gganis/root,beniz/root,mkret2/root,karies/root,abhinavmoudgil95/root,satyarth934/root,agarciamontoro/root,gganis/root,buuck/root,zzxuanyuan/root,sbinet/cxx-root,zzxuanyuan/root-compressor-dummy,gbitzes/root,mattkretz/root,olifre/root,jrtomps/root,pspe/root,CristinaCristescu/root,beniz/root,georgtroska/root,vukasinmilosevic/root,lgiommi/root,mhuwiler/rootauto,olifre/root,pspe/root,beniz/root,thomaskeck/root,krafczyk/root,Duraznos/root,esakellari/root,thomaskeck/root,olifre/root,sawenzel/root,krafczyk/root,abhinavmoudgil95/root,jrtomps/root,evgeny-boger/root,sbinet/cxx-root,veprbl/root,pspe/root,vukasinmilosevic/root,sbinet/cxx-root,krafczyk/root,satyarth934/root,gbitzes/root,buuck/root,mkret2/root,simonpf/root,georgtroska/root,zzxuanyuan/root,Y--/root,Duraznos/root,Y--/root,lgiommi/root,BerserkerTroll/root,nilqed/root,abhinavmoudgil95/root,dfunke/root,mkret2/root,karies/root,sawenzel/root,esakellari/root,Y--/root,olifre/root,agarciamontoro/root,thomaskeck/root,sirinath/root,sirinath/root,veprbl/root,evgeny-boger/root,omazapa/root,zzxuanyuan/root,root-mirror/root,pspe/root,esakellari/my_root_for_test,BerserkerTroll/root,sawenzel/root,karies/root,mkret2/root,lgiommi/root,evgeny-boger/root,arch1tect0r/root,pspe/root,CristinaCristescu/root,veprbl/root,CristinaCristescu/root,BerserkerTroll/root,abhinavmoudgil95/root,krafczyk/root,georgtroska/root,gbitzes/root,mattkretz/root,vukasinmilosevic/root,jrtomps/root,dfunke/root,nilqed/root,zzxuanyuan/root-compressor-dummy,root-mirror/root,gganis/root,veprbl/root,lgiommi/root,bbockelm/root,beniz/root,Duraznos/root,nilqed/root,omazapa/root,lgiommi/root,zzxuanyuan/root-compressor-dummy,root-mirror/root,CristinaCristescu/root,vukasinmilosevic/root,lgiommi/root,vukasinmilosevic/root,sirinath/root,krafczyk/root,gbitzes/root,esakellari/root,zzxuanyuan/root-compressor-dummy,zzxuanyuan/root,bbockelm/root,perovic/root