Make the necessary changes to work with the recent "ex_data" overhaul.
See the commit log message for that for more information.

NB: X509_STORE_CTX's use of "ex_data" support was actually misimplemented
(initialisation by "memset" won't/can't/doesn't work). This fixes that but
requires that X509_STORE_CTX_init() be able to handle errors - so its
prototype has been changed to return 'int' rather than 'void'. All uses of
that function throughout the source code have been tracked down and
adjusted.

ssl/ssl_cert.c

diff --git a/ssl/ssl_cert.c b/ssl/ssl_cert.c
index ab2e009..fcd6ff9 100644
--- a/ssl/ssl_cert.c
+++ b/ssl/ssl_cert.c
@@ -455,7 +455,11 @@
 		return(0);
 
 	x=sk_X509_value(sk,0);
-	X509_STORE_CTX_init(&ctx,s->ctx->cert_store,x,sk);
+	if(!X509_STORE_CTX_init(&ctx,s->ctx->cert_store,x,sk))
+		{
+		SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN,ERR_R_X509_LIB);
+		return(0);
+		}
 	if (SSL_get_verify_depth(s) >= 0)
 		X509_STORE_CTX_set_depth(&ctx, SSL_get_verify_depth(s));
 	X509_STORE_CTX_set_ex_data(&ctx,SSL_get_ex_data_X509_STORE_CTX_idx(),s);