Add x1 C example / improve extract.py to extract all sections after .text

x1/Makefile

@@ -1,10 +1,20 @@
 CROSS_COMPILE:=arm-linux-gnueabihf-
 AS:=$(CROSS_COMPILE)as
+CC:=$(CROSS_COMPILE)gcc
 
 .PHONY:
-all: return.bin mrc.bin
+all: return.bin mrc.bin c/main.bin
+
+.PHONY:
+clean:
+	@rm -f *.bin */*.bin
 
 %.bin: %.S
 	@$(AS) $<
 	@./extract.py a.out $@
 	@rm -f a.out
+
+c/main.bin:
+	@$(CC) -nostdlib -static -fPIC -mcpu=cortex-a7 c/start.S c/main.c
+	@./extract.py a.out $@
+	#@rm -f a.out