UI_OpenSSL()'s session opener fails on MacOS X

If on a non-tty stdin, TTY_get() will fail with errno == ENODEV.
We didn't catch that.
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2039)

crypto/ui/ui_openssl.c

@@ -428,6 +428,15 @@ static int open_console(UI *ui)
         if (errno == EINVAL)
             is_a_tty = 0;
         else
+# endif
+# ifdef ENODEV
+            /*
+             * MacOS X returns ENODEV (Operation not supported by device),
+             * which seems appropriate.
+             */
+        if (errno == ENODEV)
+            is_a_tty = 0;
+        else
 # endif
             {
                 char tmp_num[10];