build: fix build without HAVE_CAPNG
build: fix build without HAVE_CAPNG

Otherwise, a build may fail with:

lxc/lxc_conatiner.c: In function 'lxcContainerDropCapabilities':
lxc/lxc_container.c:1662:46: error: unused parameter 'keepReboot' [-Werror=unused-parameter]

* src/lxc/lxc_container.c (lxcContainerDropCapabilities): Mark
parameter unused.

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