OSX/CI: threadweaver fails to build test

[Marko Käning]

Linking CXX executable ThreadWeaverJobTests
[100%] Built target ThreadWeaverJobTests
/Users/marko/WC/KDECI-builds/threadweaver/examples/ThumbNailer/Model.cpp:77:24: error: use of undeclared identifier 'accumulate'
    auto const soFar = accumulate(m_images.begin(), m_images.end(),
                       ^
1 error generated.
make[2]: *** [examples/ThumbNailer/CMakeFiles/ThreadWeaver_ThumbNailer.dir/Model.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [examples/ThumbNailer/CMakeFiles/ThreadWeaver_ThumbNailer.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
Linking CXX executable ThreadWeaver_HelloInternet.app/Contents/MacOS/ThreadWeaver_HelloInternet
[100%] Built target ThreadWeaver_HelloInternet
make: *** [all] Error 2


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