Update nix to 0.19 (#237)

Cargo.toml

@@ -22,7 +22,7 @@ input = { version = "0.5", default-features = false, optional = true }
 lazy_static = "1"
 libc = "0.2.70"
 libloading = "0.6.0"
-nix = "0.18"
+nix = "0.19"
 slog = "2"
 slog-stdlog = { version = "4", optional = true }
 tempfile = { version = "3.0", optional = true }

anvil/src/winit.rs

@@ -147,7 +147,7 @@ pub fn run_winit(
                 error!(log, "Error during rendering: {:?}", err);
             }
         }
-        
+
         if event_loop
             .dispatch(Some(Duration::from_millis(16)), &mut state)
             .is_err()

src/xwayland/xserver.rs

@@ -182,7 +182,7 @@ fn launch<WM: XWindowManager + 'static, T: Any>(
     let sigusr1_handler = (&mut *guard.source_maker)(inner.clone())?;
 
     // all is ready, we can do the fork dance
-    let child_pid = match fork() {
+    let child_pid = match unsafe { fork() } {
         Ok(ForkResult::Parent { child }) => {
             // we are the main smithay process
             child
@@ -195,7 +195,7 @@ fn launch<WM: XWindowManager + 'static, T: Any>(
             set.add(signal::Signal::SIGCHLD);
             // we can't handle errors here anyway
             let _ = signal::sigprocmask(signal::SigmaskHow::SIG_BLOCK, Some(&set), None);
-            match fork() {
+            match unsafe { fork() } {
                 Ok(ForkResult::Parent { child }) => {
                     // we are still the first child
                     let sig = set.wait();