Issue #93: fix invalid -z option in come CI systems

Author: bpicode

Makefile

@@ -142,7 +142,7 @@ define dist
 	@echo  -n ">> BUILD, $(1)/$(2) "
 	@(GOOS=$(1) GOARCH=$(2) go build -o $(3) $(LDFLAGS))
 	@cp $(3) build/distributions/fritzctl-$(1)-$(2)$(4)
-	@cd build/distributions && shasum -a 256 "fritzctl-$(1)-$(2)$(4)" | tee "fritzctl-$(1)-$(2)$(4).sha256" | cut -b 1-40 -z
+	@cd build/distributions && shasum -a 256 "fritzctl-$(1)-$(2)$(4)" | tee "fritzctl-$(1)-$(2)$(4).sha256" | cut -b 1-64 | tr -d "\n"
 	@$(call ok)
 endef