Don't use HOSTCFLAGS in BOOTCFLAGS

[Segher Boessenkool]

>> Also, is there any reason why you can't simply use $(CC) -m32 with
>> the kernel $(CFLAGS) ?
>
> I did think about that.  But the kernel CFLAGS does includes
> -ffixed-r2 and -Iarch/powerpc which I don't think we want here.

Both of these should be fairly harmless.  But sure, it
is cleaner to have separate flags -- the booter and the
kernel run in different environments, after all.


Segher