Sqlite: Refactor static build

Don't declare all defines of the static build anymore but only the needed
structs.

Change-Id: I84567d302edbc839852b8a9e85f104c5f915e5e1
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/sqlite/sqlitesessionchangeset.h

@@ -25,10 +25,7 @@
 
 #pragma once
 
-#ifdef SQLITE_STATIC_LIBRARY
-#include "config.h"
-#endif
-
+#include "sqlite3_fwd.h"
 #include "sqliteblob.h"
 #include "sqliteglobal.h"
 #include "sqlitevalue.h"
@@ -39,8 +36,6 @@
 #include <vector>
 #include <iosfwd>
 
-struct sqlite3_changeset_iter;
-
 namespace Sqlite {
 
 class Sessions;