[Nix-dev] kdenlive fix build

[Karn Kallio]

The kdenlive expression is does not build because the CMakeLists.txt
does not find the Concurrent module and then uses it anyway.  Maybe an
earlier version of Qt5 had the Concurrent module as a dependency of
another module that is in the find_package call.  The attached patch
fixes the build by adding the Concurrent module to the find_package use.
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