Fix include paths for CGo deps in external repositories #3115
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What type of PR is this?
Bug fix
What does this PR do? Why is it needed?
A CGo-generated header file from any repository, external or main, must
always be includeable via its path relative to its repository root.
Previously, this was not true for CGo targets in external repositories,
which required an additional
external/<repo name>/
prefix, thusbreaking references within the external repository.
Which issues(s) does this PR fix?
Fixes #3109
Other notes for review