redhat/Makefile: Fix RHEL8 python warning

Prarit Bhargavarequested to merge
prarit/kernel-ark:fix_python_warning into os-build

When building on a python2 system the following warning is displayed:

Processing /data/working-repos/kernel-ark/redhat/configs/kernel-x86_64-fedora.config ... done Processing /data/working-repos/kernel-ark/redhat/configs/kernel-x86_64-rhel.config ... done Processed config files are in /data/working-repos/kernel-ark/redhat/configs ERROR: your build environment is not compatible with RHEL8. To fix this, run: ln -s /usr/bin/python3 /usr/libexec/platform-python

Change the message to be distribution agnostic.

Signed-off-by: Prarit Bhargava prarit@redhat.com

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