Fix filesystem linking

[Meakk]

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Fix #423

[Meakk]

More complex than what I expected. What matters is the libstdc++ version, not the GCC version.
For example in our CI, we are using clang 10 with libstdc++ 8 (for the sanitizer), so we actually need the link option to fs.

[codecov[bot]]

Codecov Report

Merging #430 (6d56932) into master (a1d51cc) will increase coverage by 0.05%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #430      +/-   ##
==========================================
+ Coverage   94.88%   94.94%   +0.05%     
==========================================
  Files          91       91              
  Lines        4534     4568      +34     
==========================================
+ Hits         4302     4337      +35     
+ Misses        232      231       -1     

Impacted Files	Coverage Δ
...xtensions/Rendering/vtkF3DRendererWithColoring.cxx	98.25% <0.00%> (-0.01%)	:arrow_down:
library/VTKExtensions/Rendering/vtkF3DRenderer.cxx	99.74% <0.00%> (-0.01%)	:arrow_down:
library/src/window_impl.cxx	100.00% <0.00%> (ø)
application/F3DOptionsParser.h	100.00% <0.00%> (ø)
application/F3DOptionsParser.cxx	97.93% <0.00%> (+0.05%)	:arrow_up:
application/F3DStarter.cxx	98.10% <0.00%> (+0.19%)	:arrow_up:
library/src/options.cxx	93.46% <0.00%> (+0.61%)	:arrow_up:
application/F3DConfigFileTools.cxx	78.04% <0.00%> (+1.30%)	:arrow_up:

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