Make sure we get the definition of OPENSSL_NO_CAST.

crypto/cast/cast.h

@@ -63,6 +63,8 @@
 extern "C" {
 #endif
 
+#include <openssl/opensslconf.h>
+
 #ifdef OPENSSL_NO_CAST
 #error CAST is disabled.
 #endif

crypto/cast/casttest.c

@@ -59,6 +59,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#include <openssl/opensslconf.h> /* To see if OPENSSL_NO_CAST is defined */
 
 #include "../e_os.h"