Toolset update: VS 2022 17.3 Preview 1

[StephanTLavavej]

• This updates the toolset to VS 2022 17.3 Preview 1 (and the May 2022 Patch Tuesday). Effectively the only changes are compiler bugfixes since Toolset update: VS 2022 17.2 Preview 3 #2651 updated to 17.2 Preview 3.
  • Also use PowerShell 7.2.3 to prepare the VMSS.
• In stl/CMakeLists.txt, we don't need to include crt/src/concrt anymore.
  • This became unnecessary after Remove XP (and Server 2003) support from STL #1194 removed our ConcRT dependency and Remove unused ConcRT wrappers #1325 eliminated our inclusion of <concrtinternal.h> etc.
  • Will be paired with MSVC-internal changes to src/vctools/crt/crt_build.settings.targets.
  • This is technically unrelated to the toolset update, even in theory, but I'm already changing the build system below.
• Mention the Windows 11 SDK in the README.
  • The MSVC-internal build already uses the 22000 SDK.
  • Taking this dependency (for building/testing the STL only; consumers of the STL are unaffected as we don't drag in <Windows.h> from headers) allows us to remove a couple of long-standing workarounds.
• In filesystem.cpp, we can directly use FILE_DISPOSITION_INFO_EX now.
  • I verified with static_assert that these structs are layout-compatible, and that the constants have identical values.
  • In CMakeLists.txt, we need to increase NTDDI_VERSION in order to get the declaration of FileDispositionInfoEx. Instead of increasing it to the exact value we need, I am going further and increasing it to the maximum supported value right now, NTDDI_WIN10_CO, so that we can access other declarations if necessary (see the comment above).
  • Technically we don't need to increase _WIN32_WINNT (due to an apparent mistake in the WinSDK headers, the FILE_DISPOSITION_FLAG_DELETE etc. macros are effectively unguarded), but I am increasing it to its maximum value of Win10 for consistency.
  • Will be paired with MSVC-internal changes to src/vctools/crt/crt-common.settings.targets, setting Win32WinNt and NtddiVersion.
• Fix Tests: stop disabling warning 5105: "macro expansion producing 'defined' has undefined behavior" #854 by removing the winsdk matrix workaround. This simply deletes all of the winsdk matrices (which were burdensome to maintain, and had accumulated a small amount of unintentional divergence) and changes the affected tests to use the corresponding plain matrices.
  • ⚠️ This is inherently a stealth build break for PRs in flight - we will need to watch out for any that are adding tests with the winsdk matrix.
• Remove /Za test coverage. (No product changes.)
  • This deletes all of the /Za configurations from the remaining matrices (we never combined them with unique options so they can simply be dropped) and removes some test workarounds.
  • This is needed if we want to drop the winsdk matrix workarounds (as the WinSDK is still incompatible with /Za).
  • /Za has always been problematically buggy, but it also used to be the only way to request extra conformance from MSVC. Now, /permissive- and /Zc:preprocessor have morally superseded /Za, and /Za is officially discouraged in the documentation. We also have excellent conformance coverage from Clang in its strict mode and EDG, so it has been aeons since /Za found anything in the STL that needed to be changed. Removing this test coverage doesn't block users from using /Za with the STL, and we'll continue to fix any reported conformance issues in the library, but we won't spend effort on working around /Za bugs in the product and test code.
• Fix a single-underscore _declspec in the ancient Dev09_056375_locale_cleanup/testdll.cpp.
  • This is very distantly related to the toolset update (after removing the winsdk matrix workaround but before removing /Za, the compiler emitted errors in the WinSDK headers followed by complaining about this single-underscore extension; we should fix it even though we're dropping /Za coverage).

[strega-nil-ms]

This LGTM, but I don't feel comfortable enough with the codebase yet to be a final reviewer.

[StephanTLavavej]

Mirrored to internal MSVC-PR-398667 with passing tests. (I can easily push changes to both for code review feedback.)

[CaseyCarter]

Verified there are no remaining mentions of /Za and winsdk, and no files with winsdk in their names.