spec: Move ldconfig calls from -client to -libs

spec: Move ldconfig calls from -client to -libs

ldconfig needs to be called after installing or uninstalling
shared libraries.

For a very long time, libvirt didn't have a separate package
containing just the shared libraries, and so it shipped them
in the same one as the clients.

Since commit 70b4f0e719cd, however, shared libraries have been
moved from -client to their own -libs package; unfortunately,
the corresponding ldconfig calls were not moved at the same
time, which is what this commit takes care of.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>