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The SONAME was bumped upstream. Adjust all the files to reflect this.

Related upstream change:
 libiptc: Extend struct xtc_ops (341279e09071de01a06bde6cf988d5ec671fe0d1)
 https://git.netfilter.org/iptables/commit/?id=341279e09071de01a06bde6cf988d5ec671fe0d1

Signed-off-by: Arturo Borrero Gonzalez <arturo@debian.org>