[FAB-9219] Remove superfluous "||:" from Makefile rules

A number of trailing "||:" on Makefile rules is simply a hacky way of
representing the equivalent leading "-", meaning, "Continue processing
if this command fails." Given that all of those suffixes are on
commands that have a leading "-", there is no reason to keep them.

Change-Id: I911a35b6ce9eef7d3b5b7a079a2761068b2af4d6
Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>

Author: robertpjday

Makefile

@@ -422,25 +422,25 @@ protos: buildenv
 %-docker-clean:
 	$(eval TARGET = ${patsubst %-docker-clean,%,${@}})
 	-docker images -q $(DOCKER_NS)/fabric-$(TARGET) | xargs -I '{}' docker rmi -f '{}'
-	-@rm -rf $(BUILD_DIR)/image/$(TARGET) ||:
+	-@rm -rf $(BUILD_DIR)/image/$(TARGET)
 
 docker-clean: $(patsubst %,%-docker-clean, $(IMAGES))
 
 .PHONY: clean
 clean: docker-clean unit-test-clean release-clean
-	-@rm -rf $(BUILD_DIR) ||:
+	-@rm -rf $(BUILD_DIR)
 
 .PHONY: clean-all
 clean-all: clean gotools-clean dist-clean
-	-@rm -rf /var/hyperledger/* ||:
+	-@rm -rf /var/hyperledger/*
 
 .PHONY: dist-clean
 dist-clean:
-	-@rm -rf release/windows-amd64/hyperledger-fabric-windows-amd64.$(PROJECT_VERSION).tar.gz ||:
-	-@rm -rf release/darwin-amd64/hyperledger-fabric-darwin-amd64.$(PROJECT_VERSION).tar.gz ||:
-	-@rm -rf release/linux-amd64/hyperledger-fabric-linux-amd64.$(PROJECT_VERSION).tar.gz ||:
-	-@rm -rf release/linux-ppc64le/hyperledger-fabric-linux-ppc64le.$(PROJECT_VERSION).tar.gz ||:
-	-@rm -rf release/linux-s390x/hyperledger-fabric-linux-s390x.$(PROJECT_VERSION).tar.gz ||:
+	-@rm -rf release/windows-amd64/hyperledger-fabric-windows-amd64.$(PROJECT_VERSION).tar.gz
+	-@rm -rf release/darwin-amd64/hyperledger-fabric-darwin-amd64.$(PROJECT_VERSION).tar.gz
+	-@rm -rf release/linux-amd64/hyperledger-fabric-linux-amd64.$(PROJECT_VERSION).tar.gz
+	-@rm -rf release/linux-ppc64le/hyperledger-fabric-linux-ppc64le.$(PROJECT_VERSION).tar.gz
+	-@rm -rf release/linux-s390x/hyperledger-fabric-linux-s390x.$(PROJECT_VERSION).tar.gz
 
 %-release-clean:
 	$(eval TARGET = ${patsubst %-release-clean,%,${@}})