cmd/cgo: nested structure has too much alignment padding [1.11 backport]

[gopherbot]

@ianlancetaylor requested issue #28896 to be considered for backport to the next 1.11 minor release.

@gopherbot Please open an issue to backport to 1.11.

[gopherbot]

Change https://golang.org/cl/151778 mentions this issue: [release-branch.go1.11] cmd/cgo: use field alignment when setting field offset

[gopherbot]

Closed by merging 6fa0ace to release-branch.go1.11.