Makefile: make non-optimized variant comment a bit clearer.

Makefile-ccan

@@ -3,9 +3,9 @@
 #	SRCFILES += $(wildcard ccan/*/*.c)
 
 CCAN_CFLAGS=-g -O3 -Wall -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-declarations -Werror
+#CCAN_CFLAGS=-g -Wall -Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-declarations -Werror
 CFLAGS = $(CCAN_CFLAGS) -I. $(DEPGEN)
 
-#CFLAGS=-g -Wall -Wstrict-prototypes -Wold-style-definition -Werror $(DEPGEN)
 
 default: libccan.a