rpc runtime library isn't available in all WinAPI partitions

[maxbachmann]

Bug report

Bug description:

On Windows we always set HAVE_AF_HYPERV. However the rpc runtime library isn't available in all WinAPI partitions. This leads to a compilation failure.

CPython versions tested on:

3.13

Operating systems tested on:

No response

Linked PRs

• gh-133568: only set HAVE_AF_HYPERV on supported WinAPI partitions #133569