Removed dependency on 'https://godoc.org/golang.org/x/codereview/patch'

This is not currently needed since there are no patchset to be applied
in the current test suite. We'll find an alternative implementation if
patching is needed in the future.

Fix #147

Signed-off-by: Cristian Maglie <c.maglie@arduino.cc>

Author: cmaglie

README.md

@@ -67,7 +67,6 @@ Once done, run the following commands:
 go get github.com/go-errors/errors
 go get github.com/stretchr/testify
 go get github.com/jstemmer/go-junit-report
-go get golang.org/x/codereview/patch
 go build arduino.cc/arduino-builder
 ```
 

src/arduino.cc/builder/test/helper_tools_downloader.go

@@ -38,7 +38,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"github.com/go-errors/errors"
-	"golang.org/x/codereview/patch"
 	"io"
 	"io/ioutil"
 	"net/http"
@@ -145,14 +144,19 @@ func patchFiles(t *testing.T) {
 
 	for _, file := range files {
 		if filepath.Ext(file.Name()) == ".patch" {
-			data, err := ioutil.ReadFile(Abs(t, filepath.Join(PATCHES_FOLDER, file.Name())))
-			NoError(t, err)
-			patchSet, err := patch.Parse(data)
-			NoError(t, err)
-			operations, err := patchSet.Apply(ioutil.ReadFile)
-			for _, op := range operations {
-				utils.WriteFileBytes(op.Dst, op.Data)
-			}
+			panic("Patching for downloaded tools is not available! (see https://github.com/arduino/arduino-builder/issues/147)")
+			// XXX: find an alternative to x/codereview/patch
+			// https://github.com/arduino/arduino-builder/issues/147
+			/*
+				data, err := ioutil.ReadFile(Abs(t, filepath.Join(PATCHES_FOLDER, file.Name())))
+				NoError(t, err)
+				patchSet, err := patch.Parse(data)
+				NoError(t, err)
+				operations, err := patchSet.Apply(ioutil.ReadFile)
+				for _, op := range operations {
+					utils.WriteFileBytes(op.Dst, op.Data)
+				}
+			*/
 		}
 	}
 }