Fix sqlite3_opt_unlock_notify with USE_LIBSQLITE3 (#1262)

A valid sqlite header must always be included (like in the other
files) but sqlite3-binding.h explicitly guards against the system
library case.

Author: q66

sqlite3_opt_unlock_notify.c

@@ -5,7 +5,11 @@
 
 #ifdef SQLITE_ENABLE_UNLOCK_NOTIFY
 #include <stdio.h>
+#ifndef USE_LIBSQLITE3
 #include "sqlite3-binding.h"
+#else
+#include <sqlite3.h>
+#endif
 
 extern int unlock_notify_wait(sqlite3 *db);
 

sqlite3_opt_unlock_notify.go

@@ -12,7 +12,11 @@ package sqlite3
 #cgo CFLAGS: -DSQLITE_ENABLE_UNLOCK_NOTIFY
 
 #include <stdlib.h>
+#ifndef USE_LIBSQLITE3
 #include "sqlite3-binding.h"
+#else
+#include <sqlite3.h>
+#endif
 
 extern void unlock_notify_callback(void *arg, int argc);
 */