Use /permissive- for VS 2017 desktop projects

[microsoft]

Use /permissive- for VS 2017 desktop projects

[walbourn]

Workaround remove when upgraded to the Windows 10 SDK (17763) in this commit

[oliver27b]

hey. i wasn't sure the best way to contact you; this revolves around maintenance for desktop projects.
i was following the tutorial https://github.com/microsoft/DirectXTK12/wiki/Adding-the-DirectX-Tool-Kit
using VS2019 with 10.0.18362.0 and was having problems; NuGet kinda blew up. so i followed the project to project references and it worked. when i started adding headers, some worked, others caused the build to come up with tons of errors. after prodding around a while, i found that if i added
#include "dxgi.h" to my pch.h, everything was happy :) so the tutorial page above if you could let people know they need dxgi.h for some reason (maybe it's supposed to be a header in another file?). anyways i'm kinda new at this so excuse me if this is useless information. thanks

[walbourn]

@oliver27b - Thanks for the report. It inspired me to add an explicit test to my test suite to validate that all my public headers were including all their dependencies and were 'warnings clean'.

I was indeed missing a includes of DXGI headers in a few cases--all my previous tests, samples, and my tutorial templates include DXGI headers in the pch.h so hadn't noticed the issue before.

See this commit for the details of the fix.