ffi/unsafe/com: fix VT_BOOL representation
ffi/unsafe/com: fix VT_BOOL representation

A VT_BOOL isn't a _bool; it's a 16-bit #xFFFF or #x0000.

Closes PR 14425

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket