libical >= 2.0.0 support (patch)

[Ondřej Surý]

Hi,

Debian has recently switched to libical >= 2.0.0 that hides some
previously exported symbols.

I rewrote custom icalrecur_add_rule to reconstruct RRULE from XML or
JSON to be reparsed again with icalrecurrencetype_from_string(char *).

I understand this is not optimal, but I believe that simplicity of the
code outweights the speed.

And I suggest to drop support for libical << 2.0.0 for simplicity. And
in that case I will weed out the HAVE_ICAL_<foo> macros and send another
patch with that (0018-* is just basic to get it compiled).

Please review (and apply) attached patch. I used buf_* functions to
reconstruct the cstring, but it desperately needs a review if I am using
those correctly and if it doesn't leak memory (it probably does? But in
that case json_x_value leaks it as well).

But hey it compiles! :)

Cheers,
-- 
Ondřej Surý <ondrej at sury.org>
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