Make modules that link to crypto libs depend on them too

Just linking to $(CRYPTO_LIBS) fails in a clean, parallel build, because
the dependency is missing. This patch adds them.

Reported-by: Peter Czanik <czanik@balabit.hu>
Signed-off-by: Gergely Nagy <algernon@balabit.hu>
Merge pull request #27 from balabit/merge/h/crypto-depends

Make modules that link to crypto libs depend on them too