include/prereq.mk: fix echo commands with simple /bin/sh

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 44297

include/prereq.mk

@@ -30,12 +30,12 @@ define Require
     prereq: prereq-$(1)
 
     prereq-$(1): $(if $(PREREQ_PREV),prereq-$(PREREQ_PREV)) FORCE
-		echo -n "Checking '$(1)'... "
+		printf "Checking '$(1)'... "
 		if $(NO_TRACE_MAKE) -f $(firstword $(MAKEFILE_LIST)) check-$(1) >/dev/null 2>/dev/null; then \
 			echo 'ok.'; \
 		else \
 			echo 'failed.'; \
-			echo -e "$(PKG_NAME): $(strip $(2))" >> $(TMP_DIR)/.prereq-error; \
+			echo "$(PKG_NAME): $(strip $(2))" >> $(TMP_DIR)/.prereq-error; \
 		fi
 
     check-$(1): FORCE