Fix 'no-ec'

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3430)

ssl/statem/extensions_srvr.c

diff --git a/ssl/statem/extensions_srvr.c b/ssl/statem/extensions_srvr.c
index 22d2c4a..381e72b 100644
--- a/ssl/statem/extensions_srvr.c
+++ b/ssl/statem/extensions_srvr.c
@@ -868,6 +868,7 @@
 }
 #endif
 
+#ifndef OPENSSL_NO_EC
 int tls_construct_stoc_supported_groups(SSL *s, WPACKET *pkt,
                                         unsigned int context, X509 *x,
                                         size_t chainidx, int *al)
@@ -923,6 +924,7 @@
 
     return 1;
 }
+#endif
 
 int tls_construct_stoc_session_ticket(SSL *s, WPACKET *pkt,
                                       unsigned int context, X509 *x,