[gridengine] Add note about compatible versions

[Orion Poplawski]

commit 2f8e25952c248e7986b89b85b4adeba1b049b596
Author: Orion Poplawski <orion at cora.nwra.com>
Date:   Thu Apr 19 10:53:06 2012 -0600

    Add note about compatible versions

 gridengine.spec |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/gridengine.spec b/gridengine.spec
index 9d64f9d..3cd657a 100644
--- a/gridengine.spec
+++ b/gridengine.spec
@@ -5,6 +5,11 @@
 %define gecos Grid Engine
 %define _hardened_build 1
 
+# gridengine uses a versioned binary protocol to communicate between the master
+# and the nodes that needs to be the same on all machines in a cluster.  This
+# version is defined by GRM_GDI_VERSION in: libs/gdi/version.c 
+# No updates should be pushed that bump this version in a stable release.
+
 Name:    gridengine
 Version: 2011.11
 Release: 3.svn131%{?dist}