[package] package libipq as a shared library

[package] package libipq as a shared library

r21799 by jow  changed the staging install of libipq so that it is no
longer available as a static library but is dynamically linked in as a
shared library. However the libipq package was not being built. This
patch provides libipq.so as a package.

Signed-off-by: Ashok Rao <greatarbor@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@22436 3c298f89-4303-0410-b956-a3cf2f4a3e73