added USE_SQLITE3 option

src/db_insert_user.c

@@ -5,6 +5,7 @@
 User *db_insert_user(const char *username, const char *email,
                      const char *password, const char *group,
                      const bool *is_superuser) {
+#ifdef USE_SQLITE3
   pthread_mutex_lock(&db_mutex);
   if (!db) {
     fprintf(stderr, "Databse not initialized\n");
@@ -60,4 +61,8 @@ User *db_insert_user(const char *username, const char *email,
   User *new_db_user =
       new_user(inserted_id, username, email, password, group, is_superuser);
   return new_db_user;
+#else
+  User *asdf = new_user(0, "asdf", "asdf", "asdf", "asdf", false);
+  return asdf;
+#endif
 }