Provide metadata for error sentinel values returned by some Win32 APIs

[talagrand]

This is a follow-up to microsoft/windows-rs#2476 (comment)
Ideally, Win32 APIs that return a sentinel on failure would be annotated as such, so that the associated projection can implicitly handle these as error conditions.
Examples of such APIs: ExpandEnvironmentStringsW (returns 0 on failure) or ResumeThread (returns -1) or GlobalLock (returns NULL).

[mikebattista]

Duplicate of #536