Disable built-ins

diff -urNp --exclude-from=/home/davej/.exclude linux-3022/arch/i386/Makefile linux-10000/arch/i386/Makefile
--- linux-3022/arch/i386/Makefile
+++ linux-10000/arch/i386/Makefile
@@ -22,7 +22,7 @@ OBJCOPYFLAGS	:= -O binary -R .note -R .c
 LDFLAGS_vmlinux :=
 CHECKFLAGS	+= -D__i386__
 
-CFLAGS += -pipe -msoft-float
+CFLAGS += -pipe -msoft-float -fno-builtin-sprintf -fno-builtin-log2 -fno-builtin-puts 
 
 # prevent gcc from keeping the stack 16 byte aligned
 CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)