Utils: Simplify QtcProcess::exitMessage() interface

This was requiring parameters the process object already knows.

This is a slight behavior change in most cases, it now includes
always the command line arguments, which previously only happened
in gcctoolchain.cpp and iarewtoolchain.cpp.

Change-Id: Id25a68c397e2f1d8bf52ab29210e215b1de46c6d
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/texteditor/formattexteditor.cpp

@@ -93,7 +93,7 @@ static FormatTask format(FormatTask task)
         process.runBlocking({executable, options});
         if (process.result() != QtcProcess::Finished) {
             task.error = QString(QT_TRANSLATE_NOOP("TextEditor", "Failed to format: %1."))
-                             .arg(process.exitMessage(executable, 5));
+                             .arg(process.exitMessage());
             return task;
         }
         const QString output = process.stdErr();