[yocto] Proper use of remove and append

[Burton, Ross]

On 22 July 2015 at 13:28, Gary Thomas <gary at mlbassoc.com> wrote:

> This didn't work:
>   PACKAGECONFIG_pn-opencv_remove = "libv4l"
> but this did:
>   PACKAGECONFIG_remove_pn-opencv = "libv4l"
>

Correct.  _append and _remove go first.

Until _remove was added I remembered this by thinking "overrides are
alphabetical", so _append goes first.  That's not the actual rule, but
helped concrete the ordering in my mind!

Ross
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