11238 librtld_db demos should work with gcc 7

@@ -328,11 +328,11 @@
                 return (PS_ERR);
 
         if (read(lwpfd, &lwpstatus, sizeof (lwpstatus)) == -1)
                 return (PS_ERR);
 
-        gregset = lwpstatus.pr_reg;
+        memcpy(gregset, lwpstatus.pr_reg, sizeof (*gregset));
 
         (void) close(lwpfd);
         return (PS_OK);
 }