dh.c: Initialize libgcrypt only if not done before
client.c: Remove cleanup of cryptograhpic library. This needs to be put
somewhere, like in a crypto_finish function or something.
git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@70 7dcaeef0-15fb-0310-b436-a5af3365683c