Provide dummy implementation of RAND_file_name.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@20064 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/des/rand.c

@@ -178,3 +178,9 @@ RAND_write_file(const char *filename)
 
     return res;
 }
+
+const char *
+RAND_file_name(char *filename, size_t size)
+{
+    return NULL;
+}