LibreSSL now provides OPENSSL_cleanup()

Index: lib_pypy/_cffi_ssl/_cffi_src/openssl/crypto.py
--- lib_pypy/_cffi_ssl/_cffi_src/openssl/crypto.py.orig
+++ lib_pypy/_cffi_ssl/_cffi_src/openssl/crypto.py
@@ -92,9 +92,7 @@ static const long Cryptography_HAS_LOCKING_CALLBACKS =
 #endif
 
 #if CRYPTOGRAPHY_OPENSSL_LESS_THAN_110
-static const long Cryptography_HAS_OPENSSL_CLEANUP = 0;
-
-void (*OPENSSL_cleanup)(void) = NULL;
+static const long Cryptography_HAS_OPENSSL_CLEANUP = 1;
 
 /* This function has a significantly different signature pre-1.1.0. since it is
  * for testing only, we don't bother to expose it on older OpenSSLs.
