use the MacOS X command sw_vers in a backward compatible way.
use the MacOS X command sw_vers in a backward compatible way.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@9214 27541ba8-7e3a-0410-8455-c3a389f83636

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