[PATCH] use $(target_cpu) in conf/*.rmk

[Robert Millan]

This patch replaces a few hardcoded architecture names in conf/*.rmk
with $(target_cpu).  It makes it easier to share code.

As a result of this, the setjmp module declarations are unified.

grub-emu can too be unified similarly, although 
util/$(target_cpu)/$(platform)/misc.c
might be better off with a complete merge (they're always identical, or almost).

-- 
Robert Millan

  The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
  how) you may access your data; but nobody's threatening your freedom: we
  still allow you to remove your data and not access it at all."

vars_in_mk.diff
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