bpo-43269: Remove redundant extern keywords (GH-24605)

diff --git a/Modules/_sqlite/row.c b/Modules/_sqlite/row.c
index 97a5a17..f9dfcbd 100644
--- a/Modules/_sqlite/row.c
+++ b/Modules/_sqlite/row.c
@@ -243,7 +243,8 @@ static PyType_Spec row_spec = {
 
 PyTypeObject *pysqlite_RowType = NULL;
 
-extern int pysqlite_row_setup_types(PyObject *module)
+int
+pysqlite_row_setup_types(PyObject *module)
 {
     pysqlite_RowType = (PyTypeObject *)PyType_FromModuleAndSpec(module, &row_spec, NULL);
     if (pysqlite_RowType == NULL) {