opkg: Fix poor operator combination choice
Combining :append with += rarely makes sense. Improve it to use the standard
format (and tweak the implied spacing).
Signed-off-by: 
Richard Purdie <richard.purdie@linuxfoundation.org>
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Combining :append with += rarely makes sense. Improve it to use the standard
format (and tweak the implied spacing).
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>