Utils: Fix compilation on Windows

Amends 825c89987c.

Change-Id: I1ec04bcc8b67870bdc26dccb4e67052a32c7ef94
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/utils/qtcprocess.cpp

@@ -638,9 +638,7 @@ public:
                         + QLatin1String("/qtcreator_ctrlc_stub.exe");
             }
             ProcessArgs::addArgs(&args, arguments.toWindowsArgs());
-#ifdef Q_OS_WIN
-            m_process->setNativeArguments(args);
-#endif
+            m_setup.m_nativeArguments = args;
             // Note: Arguments set with setNativeArgs will be appended to the ones
             // passed with start() below.
             start(commandString, QStringList(), workingDirectory, m_writeData);