hWaitForInput is broken on Windows

As noted in #16160:

Compile failed (exit code 1) errors were:
[1 of 1] Compiling Main             ( hWaitForInput-accurate-socket.hs, hWaitForInput-accurate-socket.o )

hWaitForInput-accurate-socket.hs:8:1: error:
    Could not find module ‘System.Posix.IO’
    Use -v (or `:set -v` in ghci) to see a list of the files searched for.

*** unexpected failure for hWaitForInput-accurate-socket(normal)

Trac metadata

Trac field	Value
Version	8.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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