FAB-6351 Fix orderer version command

The orderer version command is currently
not working correctly when the orderer is
built via make release.  Turns out that
the metadata flags were not being properly
set when running `make release`.
`make orderer` works as expected.

Change-Id: I1960c5461f23770ed8e0f80929447b60b7456912
Signed-off-by: Gari Singh <gari.r.singh@gmail.com>

Makefile

@@ -354,6 +354,8 @@ release/%/bin/cryptogen: $(PROJECT_FILES)
 	mkdir -p $(@D)
 	$(CGO_FLAGS) GOOS=$(GOOS) GOARCH=$(GOARCH) go build -o $(abspath $@) -tags "$(GO_TAGS)" -ldflags "$(GO_LDFLAGS)" $(pkgmap.$(@F))
 
+release/%/bin/orderer: GO_LDFLAGS = $(patsubst %,-X $(PKGNAME)/common/metadata.%,$(METADATA_VAR))
+
 release/%/bin/orderer: $(PROJECT_FILES)
 	@echo "Building $@ for $(GOOS)-$(GOARCH)"
 	mkdir -p $(@D)