add missing include (#2933)

bkuhls · web-flow · commit e860c31d3df5 · 2022-12-26T12:34:25.000+07:00
Fixes build error with qt5 on Linux:

stellarium-1.2/plugins/MeteorShowers/src/MeteorShowersMgr.hpp:331:12:
 error: field 'm_lastUpdate' has incomplete type 'QDateTime'
diff --git a/plugins/MeteorShowers/src/MeteorShowersMgr.hpp b/plugins/MeteorShowers/src/MeteorShowersMgr.hpp
@@ -20,6 +20,7 @@
 #ifndef METEORSHOWERSMGR_HPP
 #define METEORSHOWERSMGR_HPP
 
+#include <QDateTime>
 #include <QNetworkReply>
 #include <QNetworkAccessManager>
 
