quiet.mk: Fix newline generation in error message

Not all echo implementations support escape characters and newline
insertion. Make sure quiet.mk does not use escape characters to generate
newlines and instead split the output over multiple echo commands to get
the same effect.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

quiet.mk

@@ -28,7 +28,9 @@ ifneq ($(VERBOSE),1)
 	(ERR=$$?; if [ $$ERR = 0 ]; then \
 		echo " $(GREEN)OK$(NC)"; \
 	else \
-		echo " $(RED)FAILED$(NC)\nFor details see $(HL)$(CURDIR)/$(strip $(2))$(NC)\n"; \
+		echo " $(RED)FAILED$(NC)"; \
+		echo "For details see $(HL)$(CURDIR)/$(strip $(2))$(NC)"; \
+		echo ""; \
 	fi; exit $$ERR)
   endef