virInitctlRequest: Don't hardcode 384 bytes size
virInitctlRequest: Don't hardcode 384 bytes size

When MAXHOSTNAMELEN is set we have to take it's value into account.
Otherwise the build fails on kFreeBSD (FreeBSD kernel and GNU userland)

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