Fix MSVC compile after Shared Memory patch

[mstembera]

Compile on MSVC got broken by #6173
No functional change
bench: 2626086

[anematode]

How hard would it be to add MSVC to CI?

[mstembera]

How hard would it be to add MSVC to CI?

We used to have it till #3800
It got removed because it failed once #3797 when the stack size wasn't adjusted properly.

[vondele]

It is possible to add msvc to the github actions based ci https://github.com/ilammy/msvc-dev-cmd but I think we have very few users of that toolchain (1 I think ;-) )

[Matthies]

MSVC Users: ||

[vondele]

will merge, but can either 2 msvc users look into creating the ci action for it? Otherwise, it is unavoidable that we'll break it repeatedly, it really is not a setup we really care about.