This would probably make it easier for multi OS code, and also make
it easier to MFC some of the affected code into -stable ??
I think it's probably better to allow people to choose how to do
it in their own code. Justin has already asked that we hang off on
making any changes to the cam code until the M_ZERO flag is also
available in -stable.
Given that it is a relatively trivial change to add the M_ZERO flag
I presume it can be MFCed quite quickly. We don't need to merge
back the patch enabling it's use though. It's probably best kept
as a "forward compatablilty" thing.
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