Vendor dependencies for 0.3.0 release

vendor/tracing-oslog/src/stub.rs

@@ -0,0 +1,17 @@
+use tracing_core::Subscriber;
+use tracing_subscriber::{layer::Layer, registry::LookupSpan};
+
+pub struct OsLogger;
+
+impl OsLogger {
+	pub fn new<S, C>(_subsystem: S, _category: C) -> Self
+	where
+		S: AsRef<str>,
+		C: AsRef<str>,
+	{
+		eprintln!("Initializing OsLogger on non-Apple platform! Nothing will be logged by it!");
+		Self
+	}
+}
+
+impl<S> Layer<S> for OsLogger where S: Subscriber + for<'a> LookupSpan<'a> {}