[PATCH] gcc4 fixes for sn2

This patch is needed since "warning: use of cast expressions as lvalues is 
deprecated" turned into an error in gcc4.  We can use the convenience macros 
for read access and explicit assignments for initialization.  I thought about 
using Alexandre's fixes, but this seemed a little simpler.

Signed-off-by: Jesse Barnes <jbarnes@sgi.com>

Thanks,
Jesse

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