nghttpx: Delete unused delete_bio_method

src/shrpx_connection.cc

@@ -288,8 +288,6 @@ BIO_METHOD *create_bio_method() {
   return meth;
 }
 
-void delete_bio_method(BIO_METHOD *bio_method) { BIO_meth_free(bio_method); }
-
 #else // !OPENSSL_1_1_API
 
 BIO_METHOD *create_bio_method() {
@@ -302,8 +300,6 @@ BIO_METHOD *create_bio_method() {
   return meth;
 }
 
-void delete_bio_method(BIO_METHOD *bio_method) {}
-
 #endif // !OPENSSL_1_1_API
 
 void Connection::set_ssl(SSL *ssl) {

src/shrpx_connection.h

@@ -164,10 +164,6 @@ struct Connection {
 // Creates BIO_method shared by all SSL objects.
 BIO_METHOD *create_bio_method();
 
-// Deletes given |bio_method|.  If nghttp2 is built with OpenSSL <
-// 1.1.0, this function is noop.
-void delete_bio_method(BIO_METHOD *bio_method);
-
 } // namespace shrpx
 
 #endif // SHRPX_CONNECTION_H