[go] runtime/cgo: avoid unused parameter warning

[Gopher Robot (Gerrit)]

Gopher Robot submitted the change

Change information

Commit message:

runtime/cgo: avoid unused parameter warning

Annotate the unused parameter with `__attribute__((unused))` to avoid
build failures in environments that treat unused parameters as errors.

We see this when using `rules_go`:
```
@@rules_go+//:stdlib
builder failed: error executing GoStdlib command (from stdlib rule target @@rules_go+//:stdlib) bazel-out/linux_host_platform-opt-exec-ST-f2d1f3f5d18d/bin/external/rules_go++go_sdk+main___download_0/builder_reset/builder stdlib -sdk external/rules_go++go_sdk+main___download_0 -goroot ... (remaining 16 arguments skipped)
Use --sandbox_debug to see verbose messages from the sandbox and retain the sandbox build root for debugging
stderr:
# runtime/cgo
gcc_clearenv.c:13:23: error: unused parameter '_unused' [-Werror,-Wunused-parameter]
stdlib: error running subcommand external/rules_go++go_sdk+main___download_0/bin/go: exit status 1
```

This matches the style used in `src/runtime/cgo/gcc_libinit.c` since
dc2ae2886fbcd2297d2a0ea67a5d220ae2c74152 which fixed an identical issue.

Change-Id: I8c805962b88af480839f8662a1fcf4ed1e5d574d

GitHub-Last-Rev: b99fbda4f6fe7a199a59af425e997111137262a4

GitHub-Pull-Request: golang/go#77847

Reviewed-on: https://go-review.googlesource.com/c/go/+/749840

LUCI-TryBot-Result: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Reviewed-by: Ian Lance Taylor <ia...@golang.org>

Reviewed-by: Cherry Mui <cher...@google.com>

Auto-Submit: Ian Lance Taylor <ia...@golang.org>

Reviewed-by: David Chase <drc...@google.com>

Files:

• M src/runtime/cgo/gcc_clearenv.c

Change size: XS

Delta: 1 file changed, 1 insertion(+), 1 deletion(-)

Branch: refs/heads/master

Submit Requirements:

• Code-Review: +2 by Ian Lance Taylor, +1 by David Chase, +2 by Cherry Mui
• TryBots-Pass: LUCI-TryBot-Result+1 by Go LUCI

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Gerrit

Gerrit-MessageType: merged

Gerrit-Project: go

Gerrit-Branch: master

Gerrit-Change-Id: I8c805962b88af480839f8662a1fcf4ed1e5d574d

Gerrit-Change-Number: 749840

Gerrit-PatchSet: 3

Gerrit-Owner: Gerrit Bot <letsus...@gmail.com>

Gerrit-Reviewer: Cherry Mui <cher...@google.com>

Gerrit-Reviewer: David Chase <drc...@google.com>

Gerrit-Reviewer: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Gerrit-Reviewer: Gopher Robot <go...@golang.org>

Gerrit-Reviewer: Ian Lance Taylor <ia...@golang.org>

Gerrit-CC: Tamir Duberstein <tam...@gmail.com>