libpoco: including an external recipe for the poco library

A previously written recipe for the poco library and
a special OpenEmbedded config file for poco is included from
https://gitorious.digitalstrom.org/dss-oe/dss-oe/blobs/raw/master/dS/meta-dss11-production/recipes-support/poco/poco_1.3.6p2.bb
and https://gitorious.digitalstrom.org/dss-oe/dss-oe/blobs/raw/master/dS/meta-dss11-production/recipes-support/poco/files/OE



This recipe and the config is redistributed here under the same
license agreement as the original.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@oss.bmw-carit.de>