Co-authored-by: Cheng Shao <terrorjack@type.dance>

This is useless at best, and a common source of confusion.

https://github.com/haskell/cabal/pull/10145
https://github.com/sol/hpack/issues/355

Follows:

* ghc/ghc!10110
* https://github.com/haskell/core-libraries-committee/issues/144

Following ghc/ghc#22622 this PR removes the
testsuite which can only be run by the GHC testsuite driver. A separate
PR adds these tests directly to the `testsuite/tests` subdirectory of GHC.

Despite the name, `isMinTTY` is only capable of detecting the presence of old
versions of MinTTY. The name of the function is perhaps misleading in that
regard, but it is widely used enough at this point to where renaming it would
be disruptive. Instead, let's just clarify its intent in the documentation.

Resolves #216.

This adds the module `System.Win32.Semaphore` which implements
Windows semaphores and operations on them.

Note that waiting on a semaphore is done using
`System.Win32.Event.waitForSingleObject`, and freeing a semaphore
is done using `System.Win32.File.closeHandle`.

Fixes #211.

Closes https://github.com/haskell/win32/issues/208

Microsoft has stopped providing this circa 2020,
but there is an archive available.

failIfWithRetry is like failIf, not failIfFalse_. The types make this
clear.

In preparation for AFPP.