Log Message:
Update to 1.23:

* Version 1.23 (released 2011-11-25) [stable]

** stringprep.h: Now #include's sys/types.h instead of unistd.h for ssize_t.
Some systems (e.g., Mingw with MSVC 9) does not have unistd.h.

** idn-free.h: Protect prototypes with 'extern "C"' marker.
Reported by Bittner Ede <bittner.ede@euronetrt.hu>.

** doc: Update link to experimental TLD tables.
The new link is <https://github.com/gnuthor/tldchk>.

** Update gnulib files and translations.

** QA: Improved cyclo output.  Update GTK-DOC files.  Various bugfixes.

** API and ABI is backwards compatible with the previous version.