cmd/cgo: types regression for anonymous structs [1.14 backport]

[gopherbot]

@ianlancetaylor requested issue #38408 to be considered for backport to the next 1.14 minor release.

@gopherbot Please add issue for backport to Go 1.14.

This is an incompatible change to how cgo handles anonymous structs. There is no workaround for people using C headers that use the construct that changed incompatibly. We should fix this in the 1.14 branch.

[ianlancetaylor]

Regression from 1.13. No workaround for people using existing C headers. Cherry pick approved.

[gopherbot]

Change https://golang.org/cl/228107 mentions this issue: [release-branch.go1.14] cmd/cgo: use consistent tag for a particular struct

[gopherbot]

Closed by merging 768e5d1 to release-branch.go1.14.