Migrate from winapi to windows-sys (#4346)

* Migrate from `winapi` to `windows-sys`

I believe that Microsoft itself is supporting the development of
`windows-sys` and it's also used by `cap-std` now so this switches
Wasmtime's dependencies on Windows APIs from the `winapi` crate to the
`windows-sys` crate. We still have `winapi` in our dependency graph but
that may get phased out over time.

* Make windows-sys a target-specific dependency

Cargo.lock

@@ -3339,7 +3339,7 @@ dependencies = [
  "wasmtime-runtime",
  "wasmtime-wasi",
  "wat",
- "winapi",
+ "windows-sys",
 ]
 
 [[package]]
@@ -3401,7 +3401,7 @@ dependencies = [
  "sha2",
  "tempfile",
  "toml",
- "winapi",
+ "windows-sys",
  "zstd",
 ]
 
@@ -3442,7 +3442,7 @@ dependencies = [
  "wasmtime-wast",
  "wast 42.0.0",
  "wat",
- "winapi",
+ "windows-sys",
 ]
 
 [[package]]
@@ -3503,7 +3503,7 @@ dependencies = [
  "cc",
  "cfg-if",
  "rustix",
- "winapi",
+ "windows-sys",
 ]
 
 [[package]]
@@ -3569,7 +3569,7 @@ dependencies = [
  "wasmtime-environ",
  "wasmtime-jit-debug",
  "wasmtime-runtime",
- "winapi",
+ "windows-sys",
 ]
 
 [[package]]
@@ -3603,7 +3603,7 @@ dependencies = [
  "wasmtime-environ",
  "wasmtime-fiber",
  "wasmtime-jit-debug",
- "winapi",
+ "windows-sys",
 ]
 
 [[package]]