sqlcipher: new package

SQLCipher is a fork of SQLite that adds AES encryption using OpenSSL.
It relies on tcl to generate some of its source code, so host-tcl is
required.

[Peter: select openssl]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>