remote: Revert removing "libvirt/libvirt.h" in remote_protocol.x
remote: Revert removing "libvirt/libvirt.h" in remote_protocol.x

Commit 2d25fd4f410f removed the including of "libvirt/libvirt.h",
which breaks the build. Pushed under build-breaker rule.

zippy2/libvirt,rlaager/libvirt,elmarco/libvirt,eskultety/libvirt,datto/libvirt,shugaoye/libvirt,zhlcindy/libvirt-1.1.4-maintain,zippy2/libvirt,datto/libvirt,olafhering/libvirt,cbosdo/libvirt,libvirt/libvirt,zippy2/libvirt,crobinso/libvirt,taget/libvirt,datto/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,agx/libvirt,datto/libvirt,agx/libvirt,VenkatDatta/libvirt,elmarco/libvirt,jfehlig/libvirt,cbosdo/libvirt,taget/libvirt,cbosdo/libvirt,nertpinx/libvirt,shugaoye/libvirt,shugaoye/libvirt,jardasgit/libvirt,libvirt/libvirt,crobinso/libvirt,eskultety/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,libvirt/libvirt,andreabolognani/libvirt,olafhering/libvirt,jfehlig/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,taget/libvirt,taget/libvirt,shugaoye/libvirt,fabianfreyer/libvirt,crobinso/libvirt,rlaager/libvirt,andreabolognani/libvirt,libvirt/libvirt,zhlcindy/libvirt-1.1.4-maintain,elmarco/libvirt,cbosdo/libvirt,agx/libvirt,crobinso/libvirt,agx/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,taget/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,eskultety/libvirt,andreabolognani/libvirt,datto/libvirt,agx/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,nertpinx/libvirt,elmarco/libvirt,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,shugaoye/libvirt,zhlcindy/libvirt-1.1.4-maintain,olafhering/libvirt,fabianfreyer/libvirt,elmarco/libvirt,eskultety/libvirt,jfehlig/libvirt,zippy2/libvirt,jardasgit/libvirt,eskultety/libvirt,nertpinx/libvirt,nertpinx/libvirt,jardasgit/libvirt,rlaager/libvirt,VenkatDatta/libvirt,olafhering/libvirt,jfehlig/libvirt