idevice: Update GnuTLS code to support iOS 10

As of iOS 10 beta 4, the GnuTLS implementation idevice_connection_enable_ssl
needs to be updated to support TLS. Using +VERS-TLS-ALL did not work on some
of the devices I tested and I wasn't sure how to fix it, but +VERS-TLS1.0 is
working on every device I've tested: iOS 9.0.2, 10.0b4, 8.1.1, 6.0, and 3.0.
diff --git a/src/idevice.c b/src/idevice.c
index 1dcdae2..b6dfe4e 100644
--- a/src/idevice.c
+++ b/src/idevice.c
@@ -774,7 +774,7 @@
 	gnutls_certificate_client_set_retrieve_function(ssl_data_loc->certificate, internal_cert_callback);
 #endif
 	gnutls_init(&ssl_data_loc->session, GNUTLS_CLIENT);
-	gnutls_priority_set_direct(ssl_data_loc->session, "NONE:+VERS-SSL3.0:+ANON-DH:+RSA:+AES-128-CBC:+AES-256-CBC:+SHA1:+MD5:+COMP-NULL", NULL);
+	gnutls_priority_set_direct(ssl_data_loc->session, "NONE:+VERS-TLS1.0:+ANON-DH:+RSA:+AES-128-CBC:+AES-256-CBC:+SHA1:+MD5:+COMP-NULL", NULL);
 	gnutls_credentials_set(ssl_data_loc->session, GNUTLS_CRD_CERTIFICATE, ssl_data_loc->certificate);
 	gnutls_session_set_ptr(ssl_data_loc->session, ssl_data_loc);