[microsoft-signalr] Disable WERROR for warning STL4043

[WangWeiLin-MV]

Fix #40492, microsoft-signalr failed with VS 17.11:

C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.41.34120\include\xutility(1281): error C2220: the following warning is treated as an error
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.41.34120\include\xutility(1281): warning C4996: 'stdext::checked_array_iterator<char *>': warning STL4043: stdext::checked_array_iterator, stdext::unchecked_array_iterator, and related factory functions are non-Standard extensions and will be removed in the future. std::span (since C++20) and gsl::span can be used instead. You can define _SILENCE_STDEXT_ARR_ITERS_DEPRECATION_WARNING or _SILENCE_ALL_MS_EXT_DEPRECATION_WARNINGS to suppress this warning.

Disable CMake option WERROR to suppress it.

See:

• <iterator>: Modernize and deprecate (un)checked_array_iterator STL#3818
• https://developercommunity.visualstudio.com/t/Warning-C4996-reference-STL4043-is-causi/10629789

Checklist

• Changes comply with the maintainer guide.
• SHA512s are updated for each updated download.
• The "supports" clause reflects platforms that may be fixed by this new version.
• Any fixed CI baseline entries are removed from that file.
• Any patches that are no longer applied are deleted from the port's directory.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is added to each modified port's versions file.

Test

The port installation tests pass with the following triplets:

• x64-windows