CMake: Dependency on Boost::filesystem is wrong about gil HOT 5 OPEN

@Neumann-A I will try to get a commit in this week, next week it should be implemented. Do you have some easy test case I could throw into the commit or should I try to write my own?

from gil.

No I don't have a test case.

from gil.

Thank you for reporting this. Indeed we could add a CMake option (which default value would depend on the cpp standard) to remove a dependency that is not really needed in C++17 (unless BOOST_GIL_IO_USE_BOOST_FILESYSTEM is defined).

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Sorry last days at work were very hectic. I have created a draft PR #743, I am a bit unsure how to create a test for it yet, but after I figure it out I will request a review. If you would like to test it out, you can pull my branch and set the following:

-DBOOST_GIL_USE_BOOST_FILESYSTEM=OFF
-DCMAKE_CXX_STANDARD=17 

C++ standard can be anything equal or higher to 17.

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@simmplecoder I wouldn't worry about testing this with the already cases-overloaded CI. It would be great if one two people could try it out and confirm though.

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