fix(windows): enable dep:winapi crate with backend-bitmap

Otherwise the crate does not compile on windows with
--no-default-features --features backend-bitmap (not a particularly
useful combination of features, since it gives bitmaps without mmap
backends, which would usually drag in the winapi crate, but it should
still work).

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

Cargo.toml

@@ -13,7 +13,7 @@ autobenches = false
 
 [features]
 default = ["rawfd"]
-backend-bitmap = ["dep:libc"]
+backend-bitmap = ["dep:libc", "dep:winapi"]
 backend-mmap = ["dep:libc", "dep:winapi"]
 backend-atomic = ["arc-swap"]
 rawfd = ["dep:libc"]