opencv: update to 2.4.3 and fix some issues

* Update opencv and opencv-samples to 2.4.3
* Use tar instead of no longer available SVN repository
* Remove numpy detection patch and update related CMAKE variable
* Fix QA Issues: contains probably-redundant RPATH
* Add PACKAGES_DYNAMIC for split library packages

Signed-off-by: Stefan Herbrechtsmeier <stefan@herbrechtsmeier.net>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>