vbox: Don't warn when the linker search path doesn't contain VBoxXPCOMC.so
vbox: Don't warn when the linker search path doesn't contain VBoxXPCOMC.so

This is actually a workaround, to unbreak make check on systems
without VirtualBox.

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