use pthread for gcc v4.2.1 on OSX <10.7.
use pthread for gcc v4.2.1 on OSX <10.7.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@43161 27541ba8-7e3a-0410-8455-c3a389f83636

veprbl/root,zzxuanyuan/root,mattkretz/root,sawenzel/root,0x0all/ROOT,Dr15Jones/root,lgiommi/root,CristinaCristescu/root,mkret2/root,Duraznos/root,omazapa/root,Duraznos/root,lgiommi/root,perovic/root,davidlt/root,simonpf/root,olifre/root,Duraznos/root,smarinac/root,thomaskeck/root,satyarth934/root,ffurano/root5,evgeny-boger/root,Dr15Jones/root,0x0all/ROOT,jrtomps/root,jrtomps/root,sawenzel/root,perovic/root,agarciamontoro/root,sbinet/cxx-root,Duraznos/root,zzxuanyuan/root,gganis/root,georgtroska/root,jrtomps/root,mattkretz/root,veprbl/root,smarinac/root,mattkretz/root,buuck/root,satyarth934/root,beniz/root,agarciamontoro/root,esakellari/root,georgtroska/root,nilqed/root,bbockelm/root,olifre/root,abhinavmoudgil95/root,evgeny-boger/root,georgtroska/root,zzxuanyuan/root-compressor-dummy,gganis/root,olifre/root,gganis/root,alexschlueter/cern-root,zzxuanyuan/root,simonpf/root,abhinavmoudgil95/root,bbockelm/root,zzxuanyuan/root-compressor-dummy,Duraznos/root,sirinath/root,gganis/root,BerserkerTroll/root,sirinath/root,Dr15Jones/root,abhinavmoudgil95/root,lgiommi/root,strykejern/TTreeReader,esakellari/root,jrtomps/root,nilqed/root,tc3t/qoot,olifre/root,nilqed/root,Y--/root,esakellari/root,alexschlueter/cern-root,satyarth934/root,BerserkerTroll/root,sbinet/cxx-root,nilqed/root,vukasinmilosevic/root,satyarth934/root,esakellari/my_root_for_test,BerserkerTroll/root,krafczyk/root,arch1tect0r/root,beniz/root,0x0all/ROOT,tc3t/qoot,lgiommi/root,sbinet/cxx-root,krafczyk/root,bbockelm/root,buuck/root,omazapa/root,ffurano/root5,satyarth934/root,mhuwiler/rootauto,ffurano/root5,olifre/root,abhinavmoudgil95/root,cxx-hep/root-cern,vukasinmilosevic/root,sawenzel/root,mkret2/root,sbinet/cxx-root,tc3t/qoot,Duraznos/root,karies/root,gbitzes/root,bbockelm/root,georgtroska/root,omazapa/root,BerserkerTroll/root,agarciamontoro/root,mkret2/root,0x0all/ROOT,dfunke/root,nilqed/root,dfunke/root,lgiommi/root,gbitzes/root,pspe/root,tc3t/qoot,gganis/root,jrtomps/root,cxx-hep/root-cern,alexschlueter/cern-root,perovic/root,arch1tect0r/root,bbockelm/root,esakellari/my_root_for_test,Y--/root,tc3t/qoot,BerserkerTroll/root,zzxuanyuan/root-compressor-dummy,perovic/root,simonpf/root,krafczyk/root,jrtomps/root,abhinavmoudgil95/root,root-mirror/root,sirinath/root,bbockelm/root,thomaskeck/root,root-mirror/root,arch1tect0r/root,mkret2/root,buuck/root,strykejern/TTreeReader,CristinaCristescu/root,evgeny-boger/root,zzxuanyuan/root,smarinac/root,pspe/root,olifre/root,dfunke/root,omazapa/root,pspe/root,buuck/root,bbockelm/root,evgeny-boger/root,jrtomps/root,sirinath/root,mkret2/root,sirinath/root,buuck/root,mattkretz/root,dfunke/root,satyarth934/root,smarinac/root,krafczyk/root,tc3t/qoot,esakellari/root,kirbyherm/root-r-tools,simonpf/root,pspe/root,lgiommi/root,vukasinmilosevic/root,pspe/root,CristinaCristescu/root,omazapa/root-old,nilqed/root,abhinavmoudgil95/root,georgtroska/root,abhinavmoudgil95/root,evgeny-boger/root,beniz/root,bbockelm/root,zzxuanyuan/root-compressor-dummy,CristinaCristescu/root,ffurano/root5,thomaskeck/root,omazapa/root,karies/root,simonpf/root,gganis/root,satyarth934/root,buuck/root,mattkretz/root,sawenzel/root,jrtomps/root,jrtomps/root,davidlt/root,agarciamontoro/root,omazapa/root-old,abhinavmoudgil95/root,mkret2/root,simonpf/root,dfunke/root,smarinac/root,mhuwiler/rootauto,pspe/root,mkret2/root,krafczyk/root,omazapa/root,sirinath/root,smarinac/root,gganis/root,vukasinmilosevic/root,beniz/root,karies/root,ffurano/root5,lgiommi/root,simonpf/root,karies/root,omazapa/root-old,perovic/root,vukasinmilosevic/root,beniz/root,karies/root,omazapa/root,lgiommi/root,esakellari/my_root_for_test,0x0all/ROOT,nilqed/root,krafczyk/root,cxx-hep/root-cern,BerserkerTroll/root,agarciamontoro/root,smarinac/root,kirbyherm/root-r-tools,strykejern/TTreeReader,BerserkerTroll/root,root-mirror/root,mhuwiler/rootauto,cxx-hep/root-cern,kirbyherm/root-r-tools,Y--/root,vukasinmilosevic/root,pspe/root,dfunke/root,Y--/root,Dr15Jones/root,veprbl/root,davidlt/root,arch1tect0r/root,arch1tect0r/root,simonpf/root,arch1tect0r/root,beniz/root,krafczyk/root,zzxuanyuan/root,thomaskeck/root,vukasinmilosevic/root,gbitzes/root,lgiommi/root,vukasinmilosevic/root,perovic/root,BerserkerTroll/root,smarinac/root,root-mirror/root,gbitzes/root,pspe/root,perovic/root,perovic/root,Y--/root,mhuwiler/rootauto,sirinath/root,davidlt/root,georgtroska/root,omazapa/root-old,sawenzel/root,davidlt/root,mkret2/root,vukasinmilosevic/root,lgiommi/root,mhuwiler/rootauto,sirinath/root,esakellari/my_root_for_test,dfunke/root,zzxuanyuan/root-compressor-dummy,mattkretz/root,veprbl/root,Duraznos/root,ffurano/root5,zzxuanyuan/root-compressor-dummy,gganis/root,mattkretz/root,pspe/root,lgiommi/root,zzxuanyuan/root-compressor-dummy,abhinavmoudgil95/root,simonpf/root,olifre/root,sbinet/cxx-root,nilqed/root,zzxuanyuan/root-compressor-dummy,buuck/root,nilqed/root,sbinet/cxx-root,root-mirror/root,karies/root,sawenzel/root,davidlt/root,perovic/root,mhuwiler/rootauto,omazapa/root,georgtroska/root,satyarth934/root,root-mirror/root,evgeny-boger/root,zzxuanyuan/root,gbitzes/root,thomaskeck/root,simonpf/root,cxx-hep/root-cern,sawenzel/root,krafczyk/root,root-mirror/root,dfunke/root,zzxuanyuan/root-compressor-dummy,Dr15Jones/root,evgeny-boger/root,Y--/root,esakellari/my_root_for_test,satyarth934/root,omazapa/root,veprbl/root,sawenzel/root,zzxuanyuan/root,krafczyk/root,vukasinmilosevic/root,agarciamontoro/root,esakellari/my_root_for_test,georgtroska/root,strykejern/TTreeReader,karies/root,alexschlueter/cern-root,gganis/root,gbitzes/root,zzxuanyuan/root,0x0all/ROOT,davidlt/root,CristinaCristescu/root,nilqed/root,strykejern/TTreeReader,0x0all/ROOT,CristinaCristescu/root,beniz/root,strykejern/TTreeReader,omazapa/root-old,0x0all/ROOT,kirbyherm/root-r-tools,davidlt/root,olifre/root,abhinavmoudgil95/root,veprbl/root,abhinavmoudgil95/root,pspe/root,strykejern/TTreeReader,olifre/root,esakellari/root,thomaskeck/root,arch1tect0r/root,cxx-hep/root-cern,tc3t/qoot,krafczyk/root,gbitzes/root,gbitzes/root,esakellari/root,vukasinmilosevic/root,sawenzel/root,satyarth934/root,buuck/root,tc3t/qoot,alexschlueter/cern-root,tc3t/qoot,esakellari/my_root_for_test,veprbl/root,Duraznos/root,zzxuanyuan/root,georgtroska/root,davidlt/root,beniz/root,beniz/root,sirinath/root,davidlt/root,thomaskeck/root,pspe/root,BerserkerTroll/root,zzxuanyuan/root,BerserkerTroll/root,root-mirror/root,kirbyherm/root-r-tools,mkret2/root,veprbl/root,cxx-hep/root-cern,omazapa/root-old,mhuwiler/rootauto,Duraznos/root,Duraznos/root,esakellari/root,beniz/root,olifre/root,georgtroska/root,gbitzes/root,veprbl/root,veprbl/root,ffurano/root5,mattkretz/root,Y--/root,CristinaCristescu/root,sirinath/root,Dr15Jones/root,veprbl/root,karies/root,jrtomps/root,esakellari/root,smarinac/root,karies/root,esakellari/root,kirbyherm/root-r-tools,esakellari/root,Dr15Jones/root,arch1tect0r/root,tc3t/qoot,smarinac/root,arch1tect0r/root,bbockelm/root,omazapa/root-old,Y--/root,karies/root,sbinet/cxx-root,jrtomps/root,cxx-hep/root-cern,sirinath/root,dfunke/root,dfunke/root,omazapa/root-old,esakellari/root,mhuwiler/rootauto,Y--/root,Duraznos/root,alexschlueter/cern-root,mhuwiler/rootauto,0x0all/ROOT,esakellari/my_root_for_test,sbinet/cxx-root,davidlt/root,BerserkerTroll/root,buuck/root,omazapa/root-old,omazapa/root-old,nilqed/root,thomaskeck/root,CristinaCristescu/root,krafczyk/root,sbinet/cxx-root,simonpf/root,zzxuanyuan/root,sbinet/cxx-root,perovic/root,mhuwiler/rootauto,root-mirror/root,gganis/root,esakellari/my_root_for_test,arch1tect0r/root,CristinaCristescu/root,mattkretz/root,bbockelm/root,zzxuanyuan/root-compressor-dummy,evgeny-boger/root,mattkretz/root,gbitzes/root,Y--/root,omazapa/root,evgeny-boger/root,Y--/root,agarciamontoro/root,omazapa/root-old,buuck/root,sawenzel/root,evgeny-boger/root,agarciamontoro/root,karies/root,CristinaCristescu/root,esakellari/my_root_for_test,omazapa/root,beniz/root,mkret2/root,sawenzel/root,evgeny-boger/root,mattkretz/root,kirbyherm/root-r-tools,bbockelm/root,CristinaCristescu/root,thomaskeck/root,sbinet/cxx-root,gganis/root,gbitzes/root,agarciamontoro/root,alexschlueter/cern-root,satyarth934/root,perovic/root,dfunke/root,buuck/root,thomaskeck/root,zzxuanyuan/root,zzxuanyuan/root-compressor-dummy,olifre/root,root-mirror/root,agarciamontoro/root,mkret2/root,agarciamontoro/root,root-mirror/root,georgtroska/root,mhuwiler/rootauto,arch1tect0r/root