Go patch committed: Fix imported embedded builtin types again

[Ian Lance Taylor]

I found another bug in my recent change to fix the handling of imported
embedded builtin types.  Two bugs means I need a different approach.
This patch removes the code I added earlier and adopts a simpler
approach, in which we mark a struct field for whether it is imported.
Bootstrapped and ran Go testsuite on x86_64-unknown-linux-gnu.
Committed to mainline and 4.8 branch.

Ian

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