Bug#946149: please update build-deps on iptables

[Arturo Borrero Gonzalez]

Package: systemd
Version: 243-8
Severity: normal

Hi there!

The src:iptables debian package (v1.8.4-1) dropped the libiptc-dev and libiptc0
binary packages. The content is included now in either libip4tc or libip6tc.
Such change comes from upstream. 

This package seems to `#include <libiptc/libiptc.h>`, which is fine; But
I encourage to please update the build-deps to use libip4tc-dev instead of
libiptc-dev.

The header file is the same. Also pkg-config information should be right.

The build should be something like:

	gcc $(pkg-config xtables --cflags) yourpackage.c -lip4tc or -lip6tc

instead of:

	gcc yourpackage.c -liptc 

This may need reporting upstream. Let me know if you find any issue with this
change.