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.

apps/x509.c

diff --git a/apps/x509.c b/apps/x509.c
index f18aaf5..65b072c 100644
--- a/apps/x509.c
+++ b/apps/x509.c
@@ -1128,7 +1128,11 @@
 	EVP_PKEY_copy_parameters(upkey,pkey);
 	EVP_PKEY_free(upkey);
 
-	X509_STORE_CTX_init(&xsc,ctx,x,NULL);
+	if(!X509_STORE_CTX_init(&xsc,ctx,x,NULL))
+		{
+		BIO_printf(bio_err,"Error initialising X509 store\n");
+		goto end;
+		}
 	if (sno) bs = sno;
 	else if (!(bs = load_serial(CAfile, serialfile, create)))
 		goto end;