Log Message:
Update to 0.5.13:

Noteworthy changes in version 0.5.13 (2007-02-01)
------------------------------------------------

* Fixed shared library for newly added APIs in last release.

* Add -no-undefined to LDFLAGS, to make opencdk build under mingw32.

* Add AC_LIBTOOL_WIN32_DLL to configure.ac, which is required for
* libtool to behave correctly for cross-compiles to mingw32.

* Use gnulib for mingw32 support.

Noteworthy changes in version 0.5.12 (2007-02-01)
------------------------------------------------

* Add new API to extract public/secret OpenPGP key to S-expr.
The functions are cdk_pubkey_to_sexp and cdk_seckey_to_sexp.  Patch by
Mario Lenz <mario.lenz@gmx.net>.

* Autoconf 2.60 and automake 1.10 are now required.

* Doc fixes.