cmd/go: do not panic when computing Shlib for a package with no Target

In module mode, a non-main package lacks an install target.

The location of the .shlib corresponding to a given target is stored
in a .shlibname file alongside its install target, so in module mode
a non-main package also lacks a .shlibname file.

This also implies that such a package cannot be installed with
'go install -buildmode=linkshared', but that is a problem
for another day.

Fixes #35759
Updates #34347

Change-Id: Id3e0e068266d5fb9b061a59e70f9a65985d4973b
Reviewed-on: https://go-review.googlesource.com/c/go/+/208233
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
2 files changed
tree: 916cbcb658399fa2581fbdb7cc55899219414dac
  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
  18. SECURITY.md
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