Revert "Remove bin/podman.cross Make target"

This reverts commit c45b27ffb0.

This commit was just wrong, local-cross depends on this target as it
calls a target like "bin/podman.cross.linux.amd64". Without this it is
just broken as there is no matching target.

$ make bin/podman.cross.linux.amd64
make: *** No rule to make target 'bin/podman.cross.linux.amd64'.  Stop.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

Makefile

@@ -481,6 +481,18 @@ podman-testing: bin/podman-testing
 generate-bindings: .install.golangci-lint
 	$(GOCMD) generate ./pkg/bindings/... ;
 
+# DO NOT USE: use local-cross instead
+bin/podman.cross.%:
+	TARGET="$*"; \
+	GOOS="$${TARGET%%.*}"; \
+	GOARCH="$${TARGET##*.}"; \
+	CGO_ENABLED=0 \
+		$(GO) build \
+		$(BUILDFLAGS) \
+		$(GO_LDFLAGS) '$(LDFLAGS_PODMAN)' \
+		-tags '$(BUILDTAGS_CROSS)' \
+		-o "$@" ./cmd/podman
+
 .PHONY: local-cross
 local-cross: $(CROSS_BUILD_TARGETS) ## Cross compile podman binary for multiple architectures