OpenCV/iOS linkage with libc++ fails (Bug #2319)

Hi,

I'm trying to create an XCode project with C++11 standard library capabilities (such as std::unique_ptr).
In order to do that, I must use libc++ as my standard library, and not libstdc++ which doesn't support C++11.

However, if I'm correct, there are currently two problems with compiling my code with libc++ and linking it
with the opencv2.framework:
1. The framework is built with the default libstdc++.
2. When linking my code, I get an error from operations.hpp, saying that <ext/atomicity.h> is not found, because
there's no such file in libc++.

In the bottom line, I cannot write C++11 compliant code if I use OpenCV in my project.