cmd/vet: honor analyzer flags when running vet outside $GOROOT/src

Additional vet flags specified by user are discarded if 'go vet'
is invoked outside $GOROOT/src to check a package under $GOROOT
(including those under "vendor" of $GOROOT), fix it by avoiding the
overwriting, the logic of detemining if the package under vetting
comes from $GOROOT remains untouched.

Also checked 'go tool vet <options> <cfg>' and 'go vet <options>
<user pkg>', both worked w./w.o this fix.

Fixes #35837.

Change-Id: I549af7964e40440afd35f2d1971f77eee6f8de34
Run-TryBot: Jay Conrod <>
TryBot-Result: Gobot Gobot <>
Reviewed-by: Jay Conrod <>
2 files changed
tree: 168ebba0bd289d3af4f188444c601a9bd8482312
  1. .gitattributes
  2. .github/
  3. .gitignore
  11. api/
  12. doc/
  13. favicon.ico
  14. lib/
  15. misc/
  16. robots.txt
  17. src/
  18. test/

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