[PATCH] ARM: zImage: Skip relinking if nothing changes

[Sam Ravnborg]

> 
> I suspect this would have done the job:
> 
> $(obj)/font.o: $(srctree)/drivers/video/console/font_acorn_8x8.c
>         $(cmd,cc_o_c)'

I prefer using $(call,shipped) and let kbuild figure out how
build an .o file from a .c file.

In other words - avoiding use of the internal to Makefile.build
variables in various places.

	Sam