Disable two "Visual Studio 17 2022" warnings

[justsmth]

Issues:

N/A

Description of changes:

• Disables two warnings generated when compiling with "Visual Studio 17 2022".
• Build succeeds for both shared and static build on Windows/x86-64.

Call-outs:

N/A

Testing:

Tested on Windows Server 2019 EC2 instance:

\aws-lc\build> cmake -DBUILD_SHARED_LIBS=1 ..
-- Building for: Visual Studio 17 2022
-- The C compiler identification is MSVC 19.36.32535.0
...
repos\aws-lc\build> cmake --build .
MSBuild version 17.6.3+07e294721 for .NET Framework

  Checking Build System
  Building Custom Rule C:/Users/Administrator/repos/aws-lc/CMakeLists.txt
...

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