c-icap-modules: new package

[Thomas:
  - Do not pass custom CFLAGS and remove the hacks on the Makefile:
    since the c-icap-config script is now fixed, it returns correct
    values, and the hacks are no longer needed.
  - Add optional dependency on zlib and berkeleydb.
  - Explicitly disable clamav support.]

Signed-off-by: Guillaume GARDET <guillaume.gardet@oliseo.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>