Revert "kernel: being able to overwrite ZIO env Makefile variable"

The patch was wrong. Actyally the message says the opposite! This reverts commit 101891a7.

Revert "kernel: being able to overwrite ZIO env Makefile variable"
The patch was wrong. Actyally the message says the opposite! This reverts commit 101891a7.
b76df694 · Federico Vaga · 4dffaf2f · b76df694
Commit b76df694 authored Nov 28, 2017 by Federico Vaga
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Makefile Makefile +1 -1

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--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ REPO_PARENT ?= $(CURDIR)/..
 all: kernel tools lib libtools

 FMC_BUS ?= fmc-bus
-ZIO = zio
+ZIO ?= zio
 SPEC_SW ?= spec-sw
 SVEC_SW ?= svec-sw