re-add a binding for an upcoming pyopenssl release (backport) (#8725)

Author: reaperhulk

src/_cffi_src/openssl/ssl.py

@@ -253,6 +253,7 @@
                                    unsigned int);
 
 X509_STORE *SSL_CTX_get_cert_store(const SSL_CTX *);
+void SSL_CTX_set_cert_store(SSL_CTX *, X509_STORE *);
 int SSL_CTX_add_client_CA(SSL_CTX *, X509 *);
 
 void SSL_CTX_set_client_CA_list(SSL_CTX *, Cryptography_STACK_OF_X509_NAME *);