Fix building okular without QTextToSpeech by adding ifdefs.

Also hide speech box in gui if built without tts features.

conf/dlgaccessibility.cpp

@@ -13,7 +13,9 @@
 
 #include "settings.h"
 
+#ifdef HAVE_SPEECH
 #include <QtTextToSpeech>
+#endif
 
 DlgAccessibility::DlgAccessibility( QWidget * parent )
     : QWidget( parent ), m_selected( 0 )
@@ -32,12 +34,16 @@ DlgAccessibility::DlgAccessibility( QWidget * parent )
         page->hide();
     m_color_pages[ m_selected ]->show();
 
+#ifdef HAVE_SPEECH
     // Populate tts engines
     const QStringList engines = QTextToSpeech::availableEngines();
     for (const QString &engine: engines) {
         m_dlg->kcfg_ttsEngine->addItem (engine);
     }
     m_dlg->kcfg_ttsEngine->setProperty("kcfg_property", QByteArray("currentText"));
+#else
+    m_dlg->speechBox->hide();
+#endif
 
     connect(m_dlg->kcfg_RenderMode, static_cast<void (KComboBox::*)(int)>(&KComboBox::currentIndexChanged), this, &DlgAccessibility::slotColorMode);
 }