Log Message:
Update opencv to 2.4.6.1

Changes in 2.4.6.1:
* Hotfix for camera pipeline for Linux (V4L).

Changes in 2.4.6:
* Windows RT: added video file i/o and sample application using camera,
  enabled parallelization with TBB or MS Concurrency
* CUDA 5.5: added support for desktop and ARM
* Added Qt 5 support
* Binary compatiblility with both OpenCL 1.1/1.2 platforms. Now the binaries
  compiled with any of AMD/Intel/Nvidia's SDK can run on all other platforms.
* New functions ported, CLAHE, GoodFeaturesToTrack, TVL1 optical flow and more
* Performance optimizations, HOG and more.
* More kernel binary cache options though setBinaryDiskCache interface.
* OpenCL binaries are now included into the superpack for Windows (for VS2010
  and VS2012 only)
* Switched all the remaining parallel loops from TBB-only
  'tbb::parallel_for()' to universal 'cv::parallel_for_()' with many possible
  backends (MS Concurrency, Apple's GDC, OpenMP, Intel TBB etc.)
* iOS build scripts (together with Android ones) moved to 'opencv/platforms'
  directory
* Fixed bug with incorrect saved video from camera through CvVideoCamera
* Added 'rotateVideo' flag to the CvVideoCamera class to control camera
  preview rotation on device rotation
* Added functions to convert between UIImage and cv::Mat (just include
  opencv2/highgui/ios.h)
* Numerous bug-fixes across all the library