dbus: work with older dbus
dbus: work with older dbus

dbus 1.2.24 (on RHEL 6) lacks DBUS_TYPE_UNIX_FD; but as we aren't
trying to pass one of those anyways, we can just drop support for
it in our wrapper.  Solves this build error introduced in commit
834c9c94:

  CC     libvirt_util_la-virdbus.lo
util/virdbus.c:242: error: 'DBUS_TYPE_UNIX_FD' undeclared here (not in a function)

* src/util/virdbus.c (virDBusBasicTypes): Drop support for unix fds.

Signed-off-by: Eric Blake <a9da18479c871fe903d9590822cfe2629c6a4d11@redhat.com>

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