Adapt APK build to Qt 5.15.8

This should fix the binary factory build, but it unfortunately not backward
compatible below Qt 5.15.8. Qt 6 will need the same changes anyway, so it's
not all bad at least.

CMakeLists.txt

@@ -11,6 +11,9 @@ set(PROJECT_VERSION "22.11")
 
 set(KF5_MIN_VERSION "5.91.0")
 set(QT_MIN_VERSION "5.15.2")
+if (ANDROID)
+    set(QT_MIN_VERSION "5.15.8")
+endif()
 
 find_package(ECM ${KF5_MIN_VERSION} REQUIRED NO_MODULE)