add qt5 deps to vcpkg for easier windows building

[NateLovallo]

I wasn't able to build in windows with vcpkg using the default vcpkg manifest. This seemed to work for me using the following steps: (in repo folder) mkdir build cd build cmake -G "Visual Studio 16 2019" .. -DCMAKE_TOOLCHAIN_FILE=\path\to\scripts\buildsystems\vcpkg.cmake cmake --build .

Might be able to simplify the windows github actions as well using this method? (seems to depend on qt5 already being installed)

Cheers, Nate

[ssys-zdavis]

This, plus adding Concurrent to cmake.in (#1064) worked for me.