Update build tag constraints

This patch updates all build tag constraints to add the new format,
alongside the old one, to maintain backwards compatibility.

This was done by using `go fmt`.

See https://go.dev/doc/go1.17#gofmt and
https://golang.org/design/draft-gobuild for more details.

cmd/chasquid-util/chasquid-util.go

@@ -1,6 +1,7 @@
 // chasquid-util is a command-line utility for chasquid-related operations.
 //
 // Don't include it in the coverage build.
+//go:build !coverage
 // +build !coverage
 
 package main

cmd/dovecot-auth-cli/coverage_test.go

@@ -3,6 +3,7 @@
 //
 // See coverage_test.go for the details, this is the same horrible hack.
 //
+//go:build coveragebin
 // +build coveragebin
 
 package main

cmd/mda-lmtp/mda-lmtp.go

@@ -2,6 +2,7 @@
 //
 // See the usage below for details.
 //
+//go:build !coverage
 // +build !coverage
 
 package main

cmd/smtp-check/smtp-check.go

@@ -1,5 +1,6 @@
 // smtp-check is a command-line too for checking SMTP setups.
 //
+//go:build !coverage
 // +build !coverage
 
 package main

cmd/spf-check/spf-check.go

@@ -1,6 +1,7 @@
 // Command line tool for playing with the SPF library.
 //
 // Not for use in production, just development and experimentation.
+//go:build !coverage
 // +build !coverage
 
 package main

coverage_test.go

@@ -9,6 +9,7 @@
 //
 // The test has a build label so it's not accidentally executed during normal
 // "go test" invocations.
+//go:build coveragebin
 // +build coveragebin
 
 package main

dnsoverride.go

@@ -2,6 +2,7 @@
 // This is only used in tests, when the "dnsoverride" tag is active.
 // It requires Go >= 1.8.
 //
+//go:build dnsoverride
 // +build dnsoverride
 
 package main

internal/aliases/fuzz.go

@@ -1,5 +1,6 @@
 // Fuzz testing for package aliases.
 
+//go:build gofuzz
 // +build gofuzz
 
 package aliases

internal/auth/fuzz.go

@@ -1,5 +1,6 @@
 // Fuzz testing for package aliases.
 
+//go:build gofuzz
 // +build gofuzz
 
 package auth

internal/normalize/fuzz.go

@@ -1,5 +1,6 @@
 // Fuzz testing for package normalize.
 
+//go:build gofuzz
 // +build gofuzz
 
 package normalize

internal/smtpsrv/fuzz.go

@@ -1,5 +1,6 @@
 // Fuzz testing for package smtpsrv.  Based on server_test.
 
+//go:build gofuzz
 // +build gofuzz
 
 package smtpsrv

test/util/conngen.go

@@ -1,3 +1,4 @@
+//go:build ignore
 // +build ignore
 
 // SMTP connection generator, for testing purposes.

test/util/coverhtml.go

@@ -1,3 +1,4 @@
+//go:build ignore
 // +build ignore
 
 // Generate an HTML visualization of a Go coverage profile.

test/util/fexp.go

@@ -1,3 +1,4 @@
+//go:build ignore
 // +build ignore
 
 // Fetch an URL, and check if the response matches what we expect.

test/util/generate_cert.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build ignore
 // +build ignore
 
 // Generate a self-signed X.509 certificate for a TLS server. Outputs to

test/util/gocovcat.go

@@ -2,6 +2,7 @@
 //
 // From: https://git.lukeshu.com/go/cmd/gocovcat/
 //
+//go:build ignore
 // +build ignore
 
 // Copyright 2017 Luke Shumaker <lukeshu@parabola.nu>

test/util/loadgen.go

@@ -1,3 +1,4 @@
+//go:build ignore
 // +build ignore
 
 // SMTP load generator, for testing purposes.

test/util/minidns.go

@@ -1,3 +1,4 @@
+//go:build ignore
 // +build ignore
 
 // minidns is a trivial DNS server used for testing.