[collectd] libiptc build problems

[Mirko Buffoni]

Hi Sebastian,

>As a work-around, add "-DHAVE_IPTC_HANDLE_T -DHAVE_IP6TC_HANDLE_T" to
>the CFLAGS. This will stop working, though, when you upgrade to the new,
>official version of libiptc, but will be fixed in the next 4.7 and 4.8
>releases.

That did the trick, and compiled flawlessy.
I'm going to test now also the 4.8-cloned version that Doug made
available.

Mirko