Log Message:
Update to 0.5.10:

Noteworthy changes in version 0.5.10 (2006-10-11)
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* Fix double-free in cdk_pklist_encrypt, reported by Adam Langley.

* Fix keydb_idx_search() to handle keys at offset 0, thanks to Adam Langley.

* A pkg-config script was added, thanks to Andreas Metzler.

* Autobuild time stamps are used, for easier build robot testing.