doc/go1.15: mention 1.15.3 cgo restriction on empty structs
For #40954 Change-Id: I6a30aed31a16e820817f4ca5c7f591222e922946 Reviewed-on: https://go-review.googlesource.com/c/go/+/277432 Trust: Ian Lance Taylor <iant@golang.org> Reviewed-by:Keith Randall <khr@golang.org>
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