package/poco: bump version to 1.7.9

Removed patch applied upstream:
https://github.com/pocoproject/poco/commit/30159aea4b3f6421da9d74a8bf22aad6d3bf26b4



Renumbered remaining patches.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>