package/flannel: Use HOST_GO_TARGET_ENV

Use the newly added HOST_GO_TARGET_ENV variable to pickup the
correct go environment for package builds.

Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/flannel/flannel.mk

@@ -14,9 +14,9 @@ FLANNEL_LICENSE_FILES = LICENSE
 FLANNEL_DEPENDENCIES = host-go
 
 FLANNEL_MAKE_ENV = \
+	$(HOST_GO_TARGET_ENV) \
 	GOBIN="$(@D)/bin" \
 	GOPATH="$(@D)/gopath" \
-	GOARCH=$(GO_GOARCH) \
 	CGO_ENABLED=1
 
 FLANNEL_GLDFLAGS = \