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dtoverlay app: Keep overlay symbols private
As of 4.14, the kernel overlay merging includes any symbols defined by an overlay, which can cause clashes between overlays (and even within them in the case that an overlay deliberately adds a global symbol as a way of exporting it to other overlays). In future we may choose to make use of this mechanism as a nicer way of exporting symbols, but for now just delete all symbols before presenting the overlay to the kernel. Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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