[Bug 210505] graphics/opencv: Update to 3.1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210505

--- Comment #35 from otacilio.neto at bsd.com.br ---
This small program do not compile when using this port and -std=c++11 or above.

#include <opencv2/opencv.hpp>

int main(){
        cv::Mat myMat;

        return 0;
}

If the user uses c++98 it compiles fine, but, from c++11 and above this error
message appears:

[ota at nostromo /usr/home/ota/Desktop]$ c++ -I/usr/local/include -L/usr/local/lib
-o main main.cpp -lopencv_core -std=c++11
In file included from main.cpp:1:
In file included from /usr/local/include/opencv2/opencv.hpp:46:
In file included from /usr/local/include/opencv2/core.hpp:3165:
/usr/local/include/opencv2/core/utility.hpp:362:47: error: reinterpret_cast
from
      'nullptr_t' to 'int *' is not allowed
        operation(*reinterpret_cast<_Tp*>(0), reinterpret_cast<int*>(NULL));
                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.


When open the file this warning is there:

template<typename _Tp, typename Functor> inline
void Mat::forEach_impl(const Functor& operation) {
    if (false) {
        operation(*reinterpret_cast<_Tp*>(0), reinterpret_cast<int*>(NULL));
        // If your compiler fail in this line.
        // Please check that your functor signature is
        //     (_Tp&, const int*)   <- multidimential
        //  or (_Tp&, void*)        <- in case of you don't need current idx.
    }

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