all: clean up old go build constraints

The go directive in all 3 go.mod files is 1.23.0, so build constraints
go1.20, go1.21, and go1.22 are always satisfied. No need to check them.

Change-Id: I8c34a0fcc3486f6561aa4013d4bb9ce284f4d57d
Reviewed-on: https://go-review.googlesource.com/c/telemetry/+/673275
Auto-Submit: Dmitri Shuralyov <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Peter Weinberger <[email protected]>

Author: dmitshur

counter/countertest/countertest.go

@@ -8,6 +8,7 @@ package countertest
 
 import (
 	"sync"
+	"testing"
 
 	"golang.org/x/telemetry/counter"
 	ic "golang.org/x/telemetry/internal/counter"
@@ -61,3 +62,10 @@ func ReadStackCounter(c *counter.StackCounter) (stackCounts map[string]uint64, _
 func ReadFile(name string) (counters, stackCounters map[string]uint64, _ error) {
 	return ic.ReadFile(name)
 }
+
+func init() {
+	// Extra safety check.
+	if !testing.Testing() {
+		panic("use of this package is disallowed in non-testing code")
+	}
+}

counter/countertest/countertest_go121.go

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.21
-
 package countertest
 
 import (

counter/countertest/countertest_test.go

@@ -4,8 +4,6 @@
 
 //go:generate go run . -w
 
-//go:build go1.22
-
 // Package configgen generates the upload config file stored in the config.json
 // file of golang.org/x/telemetry/config based on the chartconfig stored in
 // config.txt.

internal/configgen/main.go

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.22
-
 package main
 
 import (

internal/configgen/main_test.go

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.22
-
 package main
 
 // knownOS is the list of past, present, and future known GOOS values.

internal/configgen/syslist.go

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.22
-
 package main
 
 import (

internal/configgen/validate.go

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.22
-
 package main
 
 import (

internal/configgen/validate_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build (js && wasm) || wasip1 || plan9 || (solaris && !go1.20)
+//go:build (js && wasm) || wasip1 || plan9
 
 package mmap
 

internal/mmap/mmap_other.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix && (!solaris || go1.20)
+//go:build unix
 
 package mmap