package/c-icap: bump version to 0.5.6

* Update hash file to two space format and add hashes from sourceforge
   website.
 * Drop 0001-Required-fixes-to-compile*.patch as it is included with
   new release

Signed-off-by: Ryan Barnett <ryanbarnett3@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>