all: go fmt ./...

Part of //go:build change (#41184).
See https://golang.org/design/draft-gobuild

Not strictly necessary but will avoid gofmt changes later
as people edit these files.

Change-Id: I20749ed82e18938a305d9425d0739f0ea7bd24c0
Reviewed-on: https://go-review.googlesource.com/c/tools/+/294414
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
gopls-CI: kokoro <noreply+kokoro@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
diff --git a/cmd/callgraph/main_test.go b/cmd/callgraph/main_test.go
index 6aeae6f..f486def 100644
--- a/cmd/callgraph/main_test.go
+++ b/cmd/callgraph/main_test.go
@@ -4,8 +4,8 @@
 
 // No testdata on Android.
 
-// +build !android
-// +build go1.11
+//go:build !android && go1.11
+// +build !android,go1.11
 
 package main