ebiten: Remove the version checker

go.mod should do this.

goversion.go

@@ -1,22 +0,0 @@
-// Copyright 2019 The Ebiten Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-//go:build go1.13
-// +build go1.13
-
-package ebiten
-
-// Ebiten forces to use Go 1.13 or later, since os.UserConfigDir is defined as of Go 1.13.
-
-const __EBITEN_REQUIRES_GO_VERSION_1_13_OR_LATER__ = true

init.go

@@ -18,8 +18,6 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicscommand"
 )
 
-var _ = __EBITEN_REQUIRES_GO_VERSION_1_13_OR_LATER__
-
 func init() {
 	graphicscommand.SetGraphicsDriver(uiDriver().Graphics())
 }