Prevent propagation of user flags to bundled autotools projects
Prevent propagation of user flags to bundled autotools projects

autotools allows to set site-wide flags to configure by reading from the
file pointed to by the environment variable CONFIG_SITE, see e.g.

  https://www.gnu.org/software/automake/manual/html_node/config_002esite.html

Since we try to set consistent compiler and linker flags in bundled
autotool projects ourself, letting flags from CONFIG_SITE leak can lead
to an inconsistent build (e.g. `./configure` on a 64-bit platform and
CONFIG_SITE with CXXFLAGS=-m32).

Since the configure of bundled projects is run in the build and not the
configure phase unset CONFIG_SITE prevents propagation of any user
flags.

Signed-off-by: Fons Rademakers <1ec492889ec4314e6ce1fb58ec289eb0358186c9@cern.ch>

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