[S390] Replace $(ARCH) macros in Makefile
Michael Holzheu authored

Since $(ARCH) is always "s390" we can replace it with "s390".
Signed-off-by: default avatarMichael Holzheu <holzheu@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
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