Add license Header to internal/build files

This adds an up to date license header to the files.

Signed-off-by: Soule BA <soule@weave.works>

internal/build/build.go

@@ -1,5 +1,5 @@
 /*
-Copyright 2021 The Flux authors
+Copyright 2022 The Flux authors
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

internal/build/build_test.go

@@ -1,5 +1,5 @@
 /*
-Copyright 2021 The Flux authors
+Copyright 2022 The Flux authors
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.

internal/build/diff.go

@@ -1,3 +1,19 @@
+/*
+Copyright 2022 The Flux 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.
+*/
+
 package build
 
 import (