[yocto] Turn off X screen blanking

[Robert D Kocisko]

I am trying to disable screen blanking in X by default.  This bug talks
about doing the same thing but it is not currently completed:
https://bugzilla.yoctoproject.org/show_bug.cgi?id=7278

I am using "dizzy" for compatibility with the meta-amd layer.  I found the
xserver-common recipe in meta-oe and I suppose I could add another patch
like 0015-xserver-common-disable-TCP-connections.patch, but I'd rather do
it using a .bbappend file in another layer.  My question is how I might go
about doing that using a bbappend file?

Thanks,
Bob Kocisko
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