Fix calico-typha --version

LDFLAGS was defined before the other variables that it depends on.

Author: Neil Jerram

Makefile

@@ -57,6 +57,15 @@ GO_BUILD_VER?=v0.16
 # we do not need to use the arch since go-build:v0.15 now is multi-arch manifest
 CALICO_BUILD=calico/go-build:$(GO_BUILD_VER)
 
+# Figure out version information.  To support builds from release tarballs, we default to
+# <unknown> if this isn't a git checkout.
+GIT_COMMIT:=$(shell git rev-parse HEAD || echo '<unknown>')
+BUILD_ID:=$(shell git rev-parse HEAD || uuidgen | sed 's/-//g')
+GIT_DESCRIPTION:=$(shell git describe --tags || echo '<unknown>')
+
+# Calculate a timestamp for any build artefacts.
+DATE:=$(shell date -u +'%FT%T%z')
+
 # Linker flags for building Typha.
 #
 # We use -X to insert the version information into the placeholder variables
@@ -70,15 +79,6 @@ LDFLAGS:=-ldflags "\
         -X $(PACKAGE_NAME)/pkg/buildinfo.GitRevision=$(GIT_COMMIT) \
         -B 0x$(BUILD_ID)"
 
-# Figure out version information.  To support builds from release tarballs, we default to
-# <unknown> if this isn't a git checkout.
-GIT_COMMIT:=$(shell git rev-parse HEAD || echo '<unknown>')
-BUILD_ID:=$(shell git rev-parse HEAD || uuidgen | sed 's/-//g')
-GIT_DESCRIPTION:=$(shell git describe --tags || echo '<unknown>')
-
-# Calculate a timestamp for any build artefacts.
-DATE:=$(shell date -u +'%FT%T%z')
-
 # List of Go files that are generated by the build process.  Builds should
 # depend on these, clean removes them.
 GENERATED_GO_FILES:=
@@ -231,7 +231,7 @@ sub-push-%:
 tag-images: imagetag
 	docker tag $(CONTAINER_NAME):latest-$(ARCH) $(CONTAINER_NAME):$(IMAGETAG)-$(ARCH)
 	docker tag $(CONTAINER_NAME):latest-$(ARCH) quay.io/$(CONTAINER_NAME):$(IMAGETAG)-$(ARCH)
-	
+
 	# Tag images for gcr.io, used by GKE.
 	docker tag $(CONTAINER_NAME):latest-$(ARCH) gcr.io/projectcalico-org/$(CONTAINER_NAME):$(IMAGETAG)
 	docker tag $(CONTAINER_NAME):latest-$(ARCH) eu.gcr.io/projectcalico-org/$(CONTAINER_NAME):$(IMAGETAG)
@@ -485,4 +485,4 @@ help:
 	@echo "ARCH (target):          $(ARCH)"
 	@echo "BUILDARCH (host):       $(BUILDARCH)"
 	@echo "CALICO_BUILD:     $(CALICO_BUILD)"
-	@echo "-----------------------------------------"
+	@echo "-----------------------------------------"