Improve privdrop condition

Cargo.toml

@@ -57,7 +57,7 @@ tokio = { version = "1.19.2", features = [
 ] }
 toml = "0.5.9"
 
-[target.'cfg(not(target_family = "windows"))'.dependencies]
+[target.'cfg(target_family = "unix")'.dependencies]
 privdrop = "0.5.2"
 
 [dependencies.prometheus]

src/main.rs

@@ -62,7 +62,7 @@ use futures::prelude::*;
 use globals::*;
 use parking_lot::Mutex;
 use parking_lot::RwLock;
-#[cfg(not(target_family = "windows"))]
+#[cfg(target_family = "unix")]
 use privdrop::PrivDrop;
 use rand::prelude::*;
 use siphasher::sip128::SipHasher13;
@@ -481,7 +481,7 @@ fn bind_listeners(
     Ok(sockets)
 }
 
-#[cfg(not(target_family = "windows"))]
+#[cfg(target_family = "unix")]
 fn privdrop(config: &Config) -> Result<(), Error> {
     let mut pd = PrivDrop::default();
     if let Some(user) = &config.user {
@@ -604,7 +604,7 @@ fn main() -> Result<(), Error> {
     runtime_builder.thread_name("encrypted-dns-");
     let runtime = runtime_builder.build()?;
 
-    #[cfg(not(target_family = "windows"))]
+    #[cfg(target_family = "unix")]
     privdrop(&config)?;
 
     let key_cache_capacity = config.dnscrypt.key_cache_capacity;