fix failure when building with --disable-debug
fix failure when building with --disable-debug

When building with --disable-debug, VIR_DEBUG expands to a nop.
But parameters to VIR_DEBUG can be variables that are passed only
to VIR_DEBUG. In the case the building system complains about unused
variables.

emaste/libvirt,taget/libvirt,crobinso/libvirt,jardasgit/libvirt,siboulet/libvirt-openvz,jfehlig/libvirt,datto/libvirt,emaste/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,cbosdo/libvirt,bjzhang/libvirt,iam-TJ/libvirt,eskultety/libvirt,jardasgit/libvirt,eskultety/libvirt,andreabolognani/libvirt,nertpinx/libvirt,nertpinx/libvirt,taget/libvirt,VenkatDatta/libvirt,agx/libvirt,shugaoye/libvirt,trainstack/libvirt,jeckersb/libvirt,bjzhang/libvirt,jeckersb/libvirt,crobinso/libvirt,zhlcindy/libvirt-1.1.4-maintain,wiedi/libvirt,emaste/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,jeckersb/libvirt,cbosdo/libvirt,libvirt/libvirt,wiedi/libvirt,zhlcindy/libvirt-1.1.4-maintain,taget/libvirt,trainstack/libvirt,andreabolognani/libvirt,datto/libvirt,siboulet/libvirt-openvz,iam-TJ/libvirt,fabianfreyer/libvirt,trainstack/libvirt,cbosdo/libvirt,jardasgit/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,rlaager/libvirt,iam-TJ/libvirt,andreabolognani/libvirt,taget/libvirt,wiedi/libvirt,emaste/libvirt,libvirt/libvirt,elmarco/libvirt,emaste/libvirt,datto/libvirt,trainstack/libvirt,iam-TJ/libvirt,warewolf/libvirt,eskultety/libvirt,jeckersb/libvirt,warewolf/libvirt,warewolf/libvirt,datto/libvirt,zippy2/libvirt,taget/libvirt,jardasgit/libvirt,nertpinx/libvirt,andreabolognani/libvirt,agx/libvirt,jfehlig/libvirt,olafhering/libvirt,andreabolognani/libvirt,warewolf/libvirt,wiedi/libvirt,iam-TJ/libvirt,zhlcindy/libvirt-1.1.4-maintain,rlaager/libvirt,jeckersb/libvirt,novel/fbsd-libvirt,nertpinx/libvirt,rlaager/libvirt,rlaager/libvirt,elmarco/libvirt,siboulet/libvirt-openvz,shugaoye/libvirt,novel/fbsd-libvirt,elmarco/libvirt,siboulet/libvirt-openvz,eskultety/libvirt,jardasgit/libvirt,datto/libvirt,cbosdo/libvirt,crobinso/libvirt,fabianfreyer/libvirt,bjzhang/libvirt,agx/libvirt,shugaoye/libvirt,emaste/libvirt,bjzhang/libvirt,zippy2/libvirt,libvirt/libvirt,zippy2/libvirt,novel/fbsd-libvirt,trainstack/libvirt,agx/libvirt,agx/libvirt,novel/fbsd-libvirt,elmarco/libvirt,shugaoye/libvirt,cbosdo/libvirt,emaste/libvirt,iam-TJ/libvirt,zhlcindy/libvirt-1.1.4-maintain,novel/fbsd-libvirt,warewolf/libvirt,iam-TJ/libvirt,VenkatDatta/libvirt,wiedi/libvirt,rlaager/libvirt,jeckersb/libvirt,olafhering/libvirt,olafhering/libvirt,crobinso/libvirt,novel/fbsd-libvirt,zhlcindy/libvirt-1.1.4-maintain,elmarco/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,novel/fbsd-libvirt,olafhering/libvirt,warewolf/libvirt,novel/fbsd-libvirt,trainstack/libvirt,novel/fbsd-libvirt,shugaoye/libvirt,wiedi/libvirt,siboulet/libvirt-openvz,zippy2/libvirt,eskultety/libvirt,wiedi/libvirt,trainstack/libvirt,warewolf/libvirt,bjzhang/libvirt,jeckersb/libvirt,libvirt/libvirt