[release-branch.go1.10] cmd/compile: permit go:cgo_import_dynamic anywhere

It's used on Solaris to import symbols from shared libraries, e.g., in
golang.org/x/sys/unix and golang.org/x/net/internal/socket.
We could use a different directive but that would require build tags
in all the places that use it.

Updates #23672
Updates #23749

Change-Id: I47fcf72a6d2862e304204705979c2056c2f78ec5
Reviewed-on: https://go-review.googlesource.com/94018
Run-TryBot: Andrew Bonventre <andybons@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
(cherry picked from commit 4a54ff21c25f1b5d7a4f73fd33214e1f8c83a9b9)
Reviewed-on: https://go-review.googlesource.com/94675
Reviewed-by: Andrew Bonventre <andybons@golang.org>
2 files changed
tree: af4263793a64ec01390ef118d28524d84ec0e3b3
  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. VERSION
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