Changes for VOS, submitted by Paul Green <Paul.Green@stratus.com>.

PR: 499
diff --git a/e_os2.h b/e_os2.h
index ecfc6c5..04d00ec 100644
--- a/e_os2.h
+++ b/e_os2.h
@@ -195,6 +195,11 @@
 # endif
 #endif
 
+/* --------------------------------- VOS ----------------------------------- */
+#ifdef OPENSSL_SYSNAME_VOS
+# define OPENSSL_SYS_VOS
+#endif
+
 /* ------------------------------- VxWorks --------------------------------- */
 #ifdef OPENSSL_SYSNAME_VXWORKS
 # define OPENSSL_SYS_VXWORKS