Define ATTRIBUTE_SENTINEL for GCC < 4.0 too
Define ATTRIBUTE_SENTINEL for GCC < 4.0 too

ATTRIBUTE_SENTINEL was defined for GCC >= 4.0 only, resulting in
compile errors when using GCC < 4.0.

crobinso/libvirt,wiedi/libvirt,taget/libvirt,shugaoye/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,kantai/libvirt-vfork,zhlcindy/libvirt-1.1.4-maintain,jfehlig/libvirt,zhlcindy/libvirt-1.1.4-maintain,dumbbell/libvirt,dumbbell/libvirt,bjzhang/libvirt,agx/libvirt,danwent/libvirt-ovs,kantai/libvirt-vfork,novel/fbsd-libvirt,leilihh/libvirt,wiedi/libvirt,olafhering/libvirt,warewolf/libvirt,rlaager/libvirt,zippy2/libvirt,olafhering/libvirt,novel/fbsd-libvirt,libvirt/libvirt,jardasgit/libvirt,crobinso/libvirt,warewolf/libvirt,jeckersb/libvirt,jfehlig/libvirt,usc-isi/libvirt,fabianfreyer/libvirt,rmarwaha/libvirt,novel/fbsd-libvirt,siboulet/libvirt-openvz,zippy2/libvirt,trainstack/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,wiedi/libvirt,andreabolognani/libvirt,iam-TJ/libvirt,rmarwaha/libvirt,novel/fbsd-libvirt,elmarco/libvirt,usc-isi/libvirt,datto/libvirt,eskultety/libvirt,rmarwaha/libvirt,datto/libvirt,jardasgit/libvirt,wiedi/libvirt,cbosdo/libvirt,olafhering/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,wiedi/libvirt,elmarco/libvirt,trainstack/libvirt,rbu/libvirt,iam-TJ/libvirt,trainstack/libvirt,nertpinx/libvirt,jardasgit/libvirt,elmarco/libvirt,andreabolognani/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,bjzhang/libvirt,wiedi/libvirt,bjzhang/libvirt,danwent/libvirt-ovs,jeckersb/libvirt,siboulet/libvirt-openvz,amery/libvirt-vserver,shugaoye/libvirt,emaste/libvirt,taget/libvirt,rmarwaha/libvirt1,rlaager/libvirt,novel/fbsd-libvirt,emaste/libvirt,kantai/libvirt-vfork,rlaager/libvirt,jeckersb/libvirt,danwent/libvirt-ovs,amery/libvirt-vserver,amery/libvirt-vserver,warewolf/libvirt,shugaoye/libvirt,trainstack/libvirt,wiedi/libvirt,iam-TJ/libvirt,amery/libvirt-vserver,rmarwaha/libvirt1,foomango/libvirt,cbosdo/libvirt,jeckersb/libvirt,warewolf/libvirt,jfehlig/libvirt,jeckersb/libvirt,crobinso/libvirt,elmarco/libvirt,VenkatDatta/libvirt,rmarwaha/libvirt1,rmarwaha/libvirt,dumbbell/libvirt,olafhering/libvirt,datto/libvirt,VenkatDatta/libvirt,rbu/libvirt,nertpinx/libvirt,novel/fbsd-libvirt,foomango/libvirt,leilihh/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,eskultety/libvirt,nertpinx/libvirt,foomango/libvirt,iam-TJ/libvirt,soulxu/libvirt-xuhj,taget/libvirt,fabianfreyer/libvirt,libvirt/libvirt,eskultety/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,jeckersb/libvirt,kantai/libvirt-vfork,cbosdo/libvirt,usc-isi/libvirt,trainstack/libvirt,eskultety/libvirt,foomango/libvirt,zippy2/libvirt,jardasgit/libvirt,shugaoye/libvirt,novel/fbsd-libvirt,kantai/libvirt-vfork,fabianfreyer/libvirt,leilihh/libvirt,rlaager/libvirt,VenkatDatta/libvirt,elmarco/libvirt,danwent/libvirt-ovs,cbosdo/libvirt,bjzhang/libvirt,dumbbell/libvirt,andreabolognani/libvirt,crobinso/libvirt,taget/libvirt,danwent/libvirt-ovs,andreabolognani/libvirt,trainstack/libvirt,fabianfreyer/libvirt,rmarwaha/libvirt1,shugaoye/libvirt,warewolf/libvirt,rbu/libvirt,soulxu/libvirt-xuhj,bjzhang/libvirt,siboulet/libvirt-openvz,cbosdo/libvirt,jfehlig/libvirt,iam-TJ/libvirt,emaste/libvirt,novel/fbsd-libvirt,emaste/libvirt,siboulet/libvirt-openvz,rmarwaha/libvirt,rmarwaha/libvirt,siboulet/libvirt-openvz,iam-TJ/libvirt,iam-TJ/libvirt,emaste/libvirt,VenkatDatta/libvirt,jeckersb/libvirt,zhlcindy/libvirt-1.1.4-maintain,agx/libvirt,warewolf/libvirt,foomango/libvirt,dumbbell/libvirt,trainstack/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,rbu/libvirt,dumbbell/libvirt,nertpinx/libvirt,agx/libvirt,emaste/libvirt,usc-isi/libvirt,warewolf/libvirt,leilihh/libvirt,VenkatDatta/libvirt,libvirt/libvirt,rmarwaha/libvirt1,jardasgit/libvirt,soulxu/libvirt-xuhj,zippy2/libvirt,datto/libvirt,soulxu/libvirt-xuhj,usc-isi/libvirt,datto/libvirt,eskultety/libvirt,agx/libvirt,leilihh/libvirt,agx/libvirt,soulxu/libvirt-xuhj,rmarwaha/libvirt1,emaste/libvirt,leilihh/libvirt,rbu/libvirt,rlaager/libvirt,nertpinx/libvirt,novel/fbsd-libvirt,zhlcindy/libvirt-1.1.4-maintain,libvirt/libvirt,amery/libvirt-vserver