libfreefare: add missing openssl dependency

If openssl is not selected, configuration fails for the libfreefare package
as follows.

  configure: error: Cannot find libcrypto.

This patch adds the missing dependency on openssl.

[Peter: use select instead of depends on]
Signed-off-by: Simon Dawson <spdawson@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>