Fixed build logging for Linux and OSX after having it ruined with previous Windows fix

Author: elektronikworkshop

src/arduino/arduino.ts

@@ -557,11 +557,13 @@ Please make sure the folder is not occupied by other procedures .`);
             }
         }
         const stderrcb = (line: string) => {
-            if (os.platform() == "win32") {
+            if (os.platform() === "win32") {
                 line = line.trim();
                 if (line.length && !line.startsWith("DEBUG ") && !line.startsWith("TRACE ") && !line.startsWith("INFO ")) {
                     arduinoChannel.channel.append(`${line}${os.EOL}`);
                 }
+            } else {
+                arduinoChannel.channel.append(line);
             }
         }