Try to load the header from a  module, if that fails: include the header. Fixes cling test suite.
Try to load the header from a  module, if that fails: include the header.
Fixes cling test suite.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@48676 27541ba8-7e3a-0410-8455-c3a389f83636

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arth934/root,omazapa/root-old,gbitzes/root,BerserkerTroll/root,dfunke/root,omazapa/root,sbinet/cxx-root,pspe/root,abhinavmoudgil95/root,beniz/root,omazapa/root,zzxuanyuan/root,vukasinmilosevic/root,zzxuanyuan/root,BerserkerTroll/root,davidlt/root,veprbl/root,buuck/root,mhuwiler/rootauto,smarinac/root,BerserkerTroll/root,sbinet/cxx-root,cxx-hep/root-cern,satyarth934/root,abhinavmoudgil95/root,mkret2/root,pspe/root,bbockelm/root,zzxuanyuan/root-compressor-dummy,karies/root,esakellari/root,simonpf/root,davidlt/root,perovic/root,esakellari/my_root_for_test,buuck/root,mhuwiler/rootauto,BerserkerTroll/root,BerserkerTroll/root,omazapa/root-old,dfunke/root,agarciamontoro/root,beniz/root,davidlt/root,esakellari/root,root-mirror/root,BerserkerTroll/root,jrtomps/root,davidlt/root,0x0all/ROOT,georgtroska/root,mattkretz/root,davidlt/root,karies/root,simonpf/root,bbockelm/root,Y--/root,pspe/root,dfunke/root,karies/root,beniz/root,smarinac/root,perovic/root,sbinet/cxx-root,sirinath/root,simonpf/root,vukasinmilosevic/root,cxx-hep/root-cern,perovic/root,jrtomps/root,dfunke/root,sbinet/cxx-root,gbitzes/root,omazapa/root,mattkretz/root,arch1tect0r/root,CristinaCristescu/root,omazapa/root-old,abhinavmoudgil95/root,sbinet/cxx-root,Y--/root,gganis/root,mkret2/root,mkret2/root,nilqed/root,zzxuanyuan/root-compressor-dummy,davidlt/root,CristinaCristescu/root,dfunke/root,sirinath/root,satyarth934/root,veprbl/root,karies/root,gganis/root,omazapa/root,zzxuanyuan/root-compressor-dummy,simonpf/root,BerserkerTroll/root,krafczyk/root,satyarth934/root,Duraznos/root,Y--/root,0x0all/ROOT,simonpf/root,esakellari/root,agarciamontoro/root,gbitzes/root,lgiommi/root,alexschlueter/cern-root,mhuwiler/rootauto,lgiommi/root,omazapa/root,abhinavmoudgil95/root,Duraznos/root,esakellari/root,mattkretz/root,pspe/root,arch1tect0r/root,omazapa/root,jrtomps/root,smarinac/root,bbockelm/root,gganis/root,vukasinmilosevic/root,root-mirror/root,root-mirror/root,arch1tect0r/root,davidlt/root,satyarth934/root,thomaskeck/root,dfunke/root,agarciamontoro/root,evgeny-boger/root,agarciamontoro/root,lgiommi/root,jrtomps/root,pspe/root,omazapa/root-old,krafczyk/root,omazapa/root-old,abhinavmoudgil95/root,gganis/root,sbinet/cxx-root,smarinac/root,beniz/root,perovic/root,sbinet/cxx-root,esakellari/my_root_for_test,bbockelm/root,CristinaCristescu/root,omazapa/root-old,krafczyk/root,CristinaCristescu/root,georgtroska/root,abhinavmoudgil95/root,BerserkerTroll/root,lgiommi/root,georgtroska/root,georgtroska/root,0x0all/ROOT,gbitzes/root,gganis/root,sirinath/root,esakellari/root,zzxuanyuan/root-compressor-dummy,olifre/root,jrtomps/root,smarinac/root,jrtomps/root,perovic/root,simonpf/root,bbockelm/root,agarciamontoro/root,dfunke/root,omazapa/root-old