Remove Ubsec engine

The ubsec engine is now considered obsolete and therefore has been
removed.

Reviewed-by: Rich Salz <rsalz@openssl.org>

README.ENGINE

diff --git a/README.ENGINE b/README.ENGINE
index 0ff8333..530a4ed 100644
--- a/README.ENGINE
+++ b/README.ENGINE
@@ -13,11 +13,10 @@
   There are currently built-in ENGINE implementations for the following
   crypto devices:
 
-      o CryptoSwift
-      o Compaq Atalla
+      o Cryptodev
+      o Microsoft CryptoAPI
+      o VIA Padlock
       o nCipher CHIL
-      o Nuron
-      o Broadcom uBSec
 
   In addition, dynamic binding to external ENGINE implementations is now
   provided by a special ENGINE called "dynamic". See the "DYNAMIC ENGINE"