[PATCH] Add a5/3 support.

Hello. Attached patch will bring a5/3 support to osmo_a5. The implementatin is done based on spec, results are compared to reference implementation from standard and test vectors. Unfortunately there are several deficiencies: - it doesn't work with real phonein test network yet - no tests included - code is probably suboptimal here and there Anyway I would love to read your comments. It would be especially great if someone will manage to test it against real phones in actual network. -- best regards, Max, http://fairwaves.ru