go-helloworld: Use the Golang examples repository

This updates the recipe to use the Golang examples repository so it
makes use of the unpack as well as standard tasks showing how easy it
can be.

(From OE-Core rev: 116d2ea1fe92725bb1265152f3db51598643a481)

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/go-examples/files/helloworld.go

@@ -1,10 +0,0 @@
-// You can edit this code!
-// Click here and start typing.
-// taken from https://golang.org/
-package main
-
-import "fmt"
-
-func main() {
-	fmt.Println("Hello, 世界")
-}

meta/recipes-extended/go-examples/go-examples.inc

@@ -1,10 +0,0 @@
-DESCRIPTION = "This is a simple example recipe that cross-compiles a Go program."
-SECTION = "examples"
-HOMEPAGE = "https://golang.org/"
-
-LICENSE = "MIT"
-LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
-
-S = "${WORKDIR}"
-
-inherit go

meta/recipes-extended/go-examples/go-helloworld_0.1.bb

@@ -1,13 +1,19 @@
-require go-examples.inc
+DESCRIPTION = "This is a simple example recipe that cross-compiles a Go program."
+SECTION = "examples"
+HOMEPAGE = "https://golang.org/"
 
-SRC_URI += " \
-  file://helloworld.go \
-"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
 
-do_compile() {
-	go build helloworld.go
-}
-
-do_install() {
-	install -D -m 0755 ${S}/helloworld ${D}${bindir}/helloworld
+SRC_URI = "git://${GO_IMPORT}"
+SRCREV = "46695d81d1fae905a270fb7db8a4d11a334562fe"
+
+GO_IMPORT = "github.com/golang/example"
+GO_INSTALL = "${GO_IMPORT}/hello"
+
+inherit go
+
+# This is just to make clear where this example is
+do_install_append() {
+    mv ${D}${bindir}/hello ${D}${bindir}/${BPN}
 }