Visual Studio 17 2022 is now a 64-bit native application.  It places the
64-bit `MSBuild.exe` in the `PATH` of VS command prompts, so prefer it
for this version and above.

This was previously attempted for older VS versions, but reverted by
commit f3cedf38 (VS: Revert "Use MSBuild matching toolset host
architecture", 2019-03-12, v3.14.0~1^2).  For now, do not use the 64-bit
MSBuild for VS 16 and below.

Fixes: #18219