replace libs/hbb_common with submodule (#502)

cargo update -p schannel to fix crash on higher rust toolchain, https://github.com/seanmonstar/reqwest/issues/2311

Signed-off-by: 21pages <sunboeasy@gmail.com>

src/main.rs

@@ -31,6 +31,7 @@ fn main() -> ResultType<()> {
     }
     let rmem = get_arg("rmem").parse::<usize>().unwrap_or(RMEM);
     let serial: i32 = get_arg("serial").parse().unwrap_or(0);
+    crate::common::check_software_update();
     RendezvousServer::start(port, serial, &get_arg_or("key", "-".to_owned()), rmem)?;
     Ok(())
 }