tst_qimage: skip exifReadComments when the feature is not active

We need to skip the exifReadComments test case if reading text from
image has been configured off, like in webOS's Yocto recipe for QtBase.

Fixes: QTBUG-105393
Change-Id: If45872ca7ed26620fa38bc6b47132363d661acdc
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
(cherry picked from commit dfaefa6c5e3ed360e97101a7bc750ee0a46114f4)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

tests/auto/gui/image/qimage/tst_qimage.cpp

@@ -3435,6 +3435,9 @@ void tst_QImage::exifInvalidData()
 
 void tst_QImage::exifReadComments()
 {
+#ifdef QT_NO_IMAGEIO_TEXT_LOADING
+    QSKIP("Reading text from image file is configured off");
+#endif
     QImage image;
     QVERIFY(image.load(m_prefix + "jpeg_exif_utf8_comment.jpg"));
     QVERIFY(!image.isNull());