This PR migrates dirs-sys-next from winapi to windows-sys.
Windows-sys is actively maintained, by Microsoft, and has recently
started to be adopted in the ecosystem; mio, parking_lot, wasmtime,
and others have moved to windows-sys.
Migrating dirs-sys-next to windows-sys will help me remove one more of
Wasmtime's transitive dependencies on winapi.
This PR migrates dirs-sys-next from winapi to windows-sys.
Windows-sys is actively maintained, by Microsoft, and has recently started to be adopted in the ecosystem; mio, parking_lot, wasmtime, and others have moved to windows-sys.
Migrating dirs-sys-next to windows-sys will help me remove one more of Wasmtime's transitive dependencies on winapi.