Revert "make tdb_cursor_next static inline"

This reverts commit 421b31d.

src/traildb.h

@@ -213,7 +213,9 @@ tdb_cursor_next() is defined here so it can be inlined
 the pragma is a workaround for older GCCs that have this issue:
 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113
 */
-static inline const tdb_event *tdb_cursor_next(tdb_cursor *cursor)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmissing-prototypes"
+__attribute__((visibility("default"))) inline const tdb_event *tdb_cursor_next(tdb_cursor *cursor)
 {
     if (cursor->num_events_left > 0 || _tdb_cursor_next_batch(cursor)){
         const tdb_event *e = (const tdb_event*)cursor->next_event;
@@ -224,5 +226,6 @@ static inline const tdb_event *tdb_cursor_next(tdb_cursor *cursor)
     }else
         return NULL;
 }
+#pragma GCC diagnostic pop
 
 #endif /* __TRAILDB_H__ */