Log Message:
Update opencv to 3.2

Many Darwin library handling patches removed because of commit 912592de4ce
  Remove "INSTALL_NAME_DIR lib" target property

Full changelog at

https://github.com/opencv/opencv/wiki/ChangeLog

Highlights:

     * Results from 11 GSoC 2016 projects have been submitted to the
       library, 9 of them have been integrated already, 2 still pending
       (the numbers below are the id's of the Pull Requests in opencv or
       opencv_contrib repository):
          + Ambroise Moreau (Delia Passalacqua) - sinusoidal patterns for
            structured light and phase unwrapping module (711)
          + Alexander Bokov (Maksim Shabunin) - DIS optical flow
            (excellent dense optical flow algorithm that is both
            significantly better and significantly faster than Farneback's
            algorithm - our baseline), and learning-based color constancy
            algorithms implementation (689, 708, 722, 736, 745, 747)
          + Tyan Vladimir (Antonella Cascitelli) - CNN based tracking
            algorithm (GOTURN) (718, 899)
          + Vladislav Samsonov (Ethan Rublee) - PCAFlow and Global Patch
            Collider algorithms implementation (710, 752)
          + Jo o Cartucho (Vincent Rabaud) - Multi-language OpenCV
            Tutorials in Python, C++ and Java (7041)
          + Jiri Horner (Bo Li) - New camera model and parallel processing
            for stitching pipeline (6933)
          + Vitaliy Lyudvichenko (Anatoly Baksheev) - Optimizations and
            improvements of dnn module (707, 750)
          + Iric Wu (Vadim Pisarevsky) - Base64 and JSON support for file
            storage (6697, 6949, 7088). Use names like
            `"myfilestorage.xml?base64"` when writing file storage to
            store big chunks of numerical data in base64-encoded form.
          + Edgar Riba (Manuele Tamburrano, Stefano Fabri) - tiny_dnn
            improvements and integration (720: pending)
          + Yida Wang (Manuele Tamburrano, Stefano Fabri) - Quantization
            and semantic saliency detection with tiny_dnn
          + Anguelos Nicolaou (Lluis Gomez) - Word-spotting CNN based
            algorithm (761: pending)