Implement FSFE REUSE for golang files (#21840)

Change all license headers to comply with REUSE specification.

Fix #16132

Co-authored-by: flynnnnnnnnnn <flynnnnnnnnnn@github>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>

modules/charset/ambiguous.go

@@ -1,7 +1,6 @@
 // This file is generated by modules/charset/ambiguous/generate.go DO NOT EDIT
 // Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package charset
 

modules/charset/ambiguous/generate.go

@@ -1,6 +1,5 @@
 // Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package main
 
@@ -135,8 +134,8 @@ func runTemplate(t *template.Template, filename string, data interface{}) error
 
 var generatorTemplate = template.Must(template.New("ambiguousTemplate").Parse(`// This file is generated by modules/charset/ambiguous/generate.go DO NOT EDIT
 // Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
+
 
 package charset
 

modules/charset/ambiguous_gen.go

@@ -1,7 +1,6 @@
 // This file is generated by modules/charset/ambiguous/generate.go DO NOT EDIT
 // Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package charset
 

modules/charset/ambiguous_gen_test.go

@@ -1,6 +1,5 @@
 // Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package charset
 

modules/charset/breakwriter.go

@@ -1,6 +1,5 @@
 // Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package charset
 

modules/charset/breakwriter_test.go

@@ -1,6 +1,5 @@
 // Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package charset
 

modules/charset/charset.go

@@ -1,6 +1,5 @@
 // Copyright 2014 The Gogs Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package charset
 

modules/charset/charset_test.go

@@ -1,6 +1,5 @@
 // Copyright 2019 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package charset
 

modules/charset/escape.go

@@ -1,6 +1,5 @@
 // Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 //go:generate go run invisible/generate.go -v -o ./invisible_gen.go
 

modules/charset/escape_status.go

@@ -1,6 +1,5 @@
 // Copyright 2021 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package charset
 

modules/charset/escape_stream.go

@@ -1,6 +1,5 @@
 // Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package charset
 

modules/charset/escape_test.go

@@ -1,6 +1,5 @@
 // Copyright 2021 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package charset
 

modules/charset/htmlstream.go

@@ -1,6 +1,5 @@
 // Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package charset
 

modules/charset/invisible/generate.go

@@ -1,6 +1,5 @@
 // Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package main
 
@@ -88,8 +87,8 @@ func runTemplate(t *template.Template, filename string, data interface{}) error
 
 var generatorTemplate = template.Must(template.New("invisibleTemplate").Parse(`// This file is generated by modules/charset/invisible/generate.go DO NOT EDIT
 // Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
+
 
 package charset
 

modules/charset/invisible_gen.go

@@ -1,7 +1,6 @@
 // This file is generated by modules/charset/invisible/generate.go DO NOT EDIT
 // Copyright 2022 The Gitea Authors. All rights reserved.
-// Use of this source code is governed by a MIT-style
-// license that can be found in the LICENSE file.
+// SPDX-License-Identifier: MIT
 
 package charset