Qbs: fix equivalent command line for "show command lines" option.

Change-Id: I91de51de3ce2fb0acc20b87992324e9ec8a26bc2
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>

src/plugins/qbsprojectmanager/qbsbuildconfiguration.cpp

@@ -301,7 +301,9 @@ QString QbsBuildConfiguration::equivalentCommandLine(const BuildStep *buildStep)
     if (stepProxy.keepGoing())
         Utils::QtcProcess::addArg(&commandLine, QLatin1String("--keep-going"));
     if (stepProxy.showCommandLines())
-        Utils::QtcProcess::addArg(&commandLine, QLatin1String("--show-command-lines"));
+        Utils::QtcProcess::addArg(&commandLine, QStringList()
+                                  << QLatin1String("--command-echo-mode")
+                                  << QLatin1String("command-line"));
     if (stepProxy.noInstall())
         Utils::QtcProcess::addArg(&commandLine, QLatin1String("--no-install"));
     if (stepProxy.cleanInstallRoot())