[go] Explicitly declare syslog dependency

We recently enabled build-time enforcement of components declaring their
dependencies, so this is currently failing the build:

```
FAILED: obj/third_party/go/go-exec-test_check_includes.gn_stamp
/usr/bin/env ../../build/gn_run_binary.sh ../../prebuilt/third_party/clang/linux-x64/bin host_x64/cmc --stamp obj/third_party/go/go-exec-test_check_includes.gn_stamp check-includes ../../third_party/go/meta/go_exec_test.cmx --fromfile obj/third_party/go/go-exec-test_check_includes_expected_includes_expected_includes
Error at ../../third_party/go/meta/go_exec_test.cmx: "../../third_party/go/meta/go_exec_test.cmx" must include sdk/lib/diagnostics/syslog/client.shard.cmx.
See: https://fuchsia.dev/fuchsia-src/development/components/build#component-manifest-includes
ninja: build stopped: subcommand failed.
```

Change-Id: Iaee29be82f67b37ab065ead46d82c45ed10edfb4
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/go/+/458396
Reviewed-by: Tamir Duberstein <tamird@google.com>
Reviewed-by: Shai Barack <shayba@google.com>
Commit-Queue: Tamir Duberstein <tamird@google.com>
Commit-Queue: James Sullivan <jfsulliv@google.com>
tree: 795d6dec47f14c95008cea5e8a2356f412e2951f
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. makefuchsia/
  6. makeroot/
  7. meta/
  8. misc/
  9. src/
  10. test/
  11. .gitattributes
  12. .gitignore
  13. AUTHORS
  14. BUILD.gn
  15. CONTRIBUTING.md
  16. CONTRIBUTORS
  17. favicon.ico
  18. LICENSE
  19. PATENTS
  20. README.md
  21. regen-fidl
  22. regen-syscalls
  23. robots.txt
  24. SECURITY.md
  25. VERSION
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