rts/win32/IOManager: Fix integer types

This code has been broken on 64-bit systems for some time: the length
and timeout arguments of `addIORequest` and `addDelayRequest`,
respectively, were declared as `int`. However, they were passed Haskell
integers from their respective primops. Integer overflow and madness
ensued. This resulted in #7325 and who knows what else.

Also, there were a few left-over `BOOL`s in here which were not passed
to Windows system calls; these were changed to C99 `bool`s.

However, there is still a bit of signedness inconsistency within the
`delay#` call-chain,

 * `GHC.Conc.IO.threadDelay` and the `delay#` primop accept `Int`
   arguments

 * The `delay#` implementation in `PrimOps.cmm` expects the timeout as
   a `W_`

 * `AsyncIO.c:addDelayRequest` expects an `HsInt` (was `int` prior to
   this patch)

 * `IOManager.c:AddDelayRequest` expects an `HsInt`` (was `int`)

 * The Windows `Sleep` function expects a `DWORD` (which is unsigned)

Test Plan: Validate on Windows

Reviewers: erikd, austin, simonmar, Phyx

Reviewed By: Phyx

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2861

GHC Trac Issues: #7325

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