extconf.rb in duckdb-0.2.7.0

- old
+ new

@@ -3,7 +3,8 @@
 dir_config('duckdb')
 if have_library('duckdb')
   have_func('duckdb_value_blob', 'duckdb.h')
   have_func('duckdb_bind_blob', 'duckdb.h')
   have_func('duckdb_appender_create', 'duckdb.h')
+  have_func('duckdb_free', 'duckdb.h')
   create_makefile('duckdb/duckdb_native')
 end