go/internal/srcimporter: simplify and fix package file lookup

The old code was a blend of (copied) code that existed before go/build,
and incorrect adjustments made when go/build was introduced. This change
leaves package path determination entirely to go/build and in the process
fixes issues with relative import paths.

Fixes #23092
Fixes #24392

Change-Id: I9e900538b365398751bace56964495c5440ac4ae
Reviewed-on: https://go-review.googlesource.com/83415
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
4 files changed
tree: 30f6f7ebda6d95e58b4dbd27123c8b97a5e104f9
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
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