Revert "androiddeployqt: Do not check for stdcpp-path in auxiliary mode"

stdcpp-path is needed to set the correct stdc++ library in libs.xml file.

This reverts commit 1366c4f046.

Change-Id: I79b398c5d97c1e98bf503ef7b95b2e9f0f18bc11
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/tools/androiddeployqt/main.cpp

@@ -900,7 +900,7 @@ bool readInputFile(Options *options)
             options->extraPlugins = extraPlugins.toString().split(QLatin1Char(','));
     }
 
-    if (!options->auxMode) {
+    {
         const QJsonValue stdcppPath = jsonObject.value(QStringLiteral("stdcpp-path"));
         if (stdcppPath.isUndefined()) {
             fprintf(stderr, "No stdcpp-path defined in json file.\n");