cmake: Fix version comparison to find Qt6TextToSpeech

...at least with Qt >= 6.10.

GREATER_EQUAL parses the passed value as a real number, not as a version
with components, so for example 6.10.2 is returned as smaller than
6.4.0. But VERSION_GREATER_EQUAL exists exactly for such cases.

Author: heirecka

src/CMakeLists.txt

@@ -513,7 +513,7 @@ IF(APPLE AND Qt6_FOUND)
 ENDIF()
 IF(ENABLE_MEDIA)
      SET(STELLARIUM_QT_LIBRARIES ${STELLARIUM_QT_LIBRARIES} Qt${QT_VERSION_MAJOR}::Multimedia Qt${QT_VERSION_MAJOR}::MultimediaWidgets)
-     IF(Qt6_FOUND AND Qt6Core_VERSION GREATER_EQUAL 6.4.0)
+     IF(Qt6_FOUND AND Qt6Core_VERSION VERSION_GREATER_EQUAL 6.4.0)
           find_package(Qt6 COMPONENTS TextToSpeech)
           IF(Qt6TextToSpeech_VERSION VERSION_GREATER_EQUAL 6.4.0)
                SET(STELLARIUM_QT_LIBRARIES ${STELLARIUM_QT_LIBRARIES} Qt6::TextToSpeech)