Remove duplicated SSL_CTX_set_verify()

Duplicated with line 920.
Our minimal OpenSSL version is v1.0.1 (See https://github.com/openssl/openssl/blob/OpenSSL_1_0_1-stable/ssl/ssl_lib.c#L2039).
Removing it does not affect program behavior.
Closes GH-6751.

Author: twose

ext/openssl/xp_ssl.c

@@ -907,7 +907,6 @@ static int php_openssl_enable_peer_verification(SSL_CTX *ctx, php_stream *stream
 	} else {
 #ifdef PHP_WIN32
 		SSL_CTX_set_cert_verify_callback(ctx, php_openssl_win_cert_verify_callback, (void *)stream);
-		SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
 #else
 		if (sslsock->is_client && !SSL_CTX_set_default_verify_paths(ctx)) {
 			php_error_docref(NULL, E_WARNING,