Fix detect_family deadlock

Fixed #1623 

Due to child blocking on stderr writing and detect_family blocking on child stdout reading

Author: NobodyXu

src/tool.rs

@@ -224,16 +224,9 @@ impl Tool {
             let mut captured_cargo_output = compiler_detect_output.clone();
             captured_cargo_output.output = OutputKind::Capture;
             captured_cargo_output.warnings = true;
-            let mut child = spawn(&mut cmd, &captured_cargo_output)?;
+            let Output { status, stdout, stderr } = spawn(&mut cmd, &captured_cargo_output)?.wait_with_output()?;
 
-            let mut out = vec![];
-            let mut err = vec![];
-            child.stdout.take().unwrap().read_to_end(&mut out)?;
-            child.stderr.take().unwrap().read_to_end(&mut err)?;
-
-            let status = child.wait()?;
-
-            let stdout = if [&out, &err]
+            let stdout = if [&stdout, &stderr]
                 .iter()
                 .any(|o| String::from_utf8_lossy(o).contains("-Wslash-u-filename"))
             {