remove goexperiment.jsonv2 build tag

* remove goexperiment.jsonv2 build tag
* replace go:build !goexperiment.jsonv2 with go:build ignore
* disable v2_diff_test.go

Author: marten-seemann

decode.go

@@ -5,7 +5,7 @@
 // Represents JSON data structure using native Go types: booleans, floats,
 // strings, arrays, and maps.
 
-//go:build !goexperiment.jsonv2
+//go:build ignore
 
 package json
 

decode_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 !goexperiment.jsonv2
+//go:build ignore
 
 package json
 

encode.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 !goexperiment.jsonv2
+//go:build ignore
 
 // Package json implements encoding and decoding of JSON as defined in RFC 7159.
 // The mapping between JSON and Go values is described in the documentation for

encode_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 !goexperiment.jsonv2
+//go:build ignore
 
 package json
 

example_marshaling_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 !goexperiment.jsonv2
+//go:build ignore
 
 package json_test
 

example_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 !goexperiment.jsonv2
+//go:build ignore
 
 package json_test
 

example_text_marshaling_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 !goexperiment.jsonv2
+//go:build ignore
 
 package json_test
 

fold.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 !goexperiment.jsonv2
+//go:build ignore
 
 package json
 

fold_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 !goexperiment.jsonv2
+//go:build ignore
 
 package json
 

fuzz_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 !goexperiment.jsonv2
+//go:build ignore
 
 package json