Assistant: Fix static linking for Linux.

main.cpp:78: undefined reference to `qt_static_plugin_qsqlite()'

The import for the DB plugin should now be generated by qmake.

Change-Id: I9da25aea8667ca34221427236b8e1d36be77da8b
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>

src/assistant/assistant/assistant.pro

@@ -107,13 +107,7 @@ mac {
     QMAKE_INFO_PLIST = Info_mac.plist
 }
 
-contains(QT_CONFIG, static): {
-    SQLPLUGINS = $$unique(sql-plugins)
-    contains(SQLPLUGINS, sqlite): {
-        QTPLUGIN += qsqlite
-        DEFINES += USE_STATIC_SQLITE_PLUGIN
-    }
-}
+QTPLUGIN += qsqlite
 
 target.path=$$[QT_INSTALL_BINS]
 INSTALLS += target

src/assistant/assistant/main.cpp

@@ -73,11 +73,6 @@
 
 QT_USE_NAMESPACE
 
-#if defined(USE_STATIC_SQLITE_PLUGIN)
-  #include <QtPlugin>
-  Q_IMPORT_PLUGIN(qsqlite)
-#endif
-
 namespace {
 
 void