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Brad King authored
VS 2017 toolsets now use this flag by default if `UseFullPaths` is not explicitly set to `false` in the .vcxproj file. Since there is no negative form of this flag there is no way for projects to turn it off through our flag map. Also, the Makefile and Ninja generators do not add this flag unless it is explicitly specified by the project. Teach our generator to set `UseFullPaths` to `false` in VS 2017 unless the project or use has explicitly specified `/FC`. Fixes: #18261
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